Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3f24692b8f47f9…

MALICIOUS

PDF

103.4 KB Created: 2021-09-06 15:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ecf900ad4d9404b02f4662719803b97d SHA-1: 78e16e6c725d6ddd7890518207cc2086abc7da1b SHA-256: 7e3f24692b8f47f933bf1aadac37347970be7da73024527f2a40da8aaab697e8
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=security+council+resolution+1325+pdf PDF link annotation
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb4c03718d---61255391680.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/66150645338.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/21016674700.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fbecf307---turenekizabekuxa.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/41346732062.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/j5i12sfh3kep5lv94np91fpr30/rezenafada.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8fd5df0e8c445ad7845bf01974dd2c54/vupadovujizin.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb9e62720---memoxobelakediwusej.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607650f00b9c8---vivosuwofurilud.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/nirelubetudupupadixavubaw.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/24a5cbe293c816c068b4afb5fab6cbb6/89050070756.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e036f1f71e---fapikemiboxuse.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132519dc8f38---zifidobo.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/12261323693.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f31be5fd0---66775618658.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/werevowafukogapogul.pdfIn PDF document text
    • http://henca.com/files/details/file/74255624492.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774a33174c5---wunibukopekimimalimiri.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/11698327500.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95431e70c2---jekugawuzanerokivedupe.pdfPDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8ea3d4ac7---80239558468.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/71h1bqfgg0ghou4np9c7huben4/37612563393.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/28890147652.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/25828465596.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/38721930815.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 18864 bytes
SHA-256: 599ac1b1efd767ca07e77346d283451da6a2cef04d8fddef30f880dff33827fb
font_01_sfnt_off00015d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17572 11216 bytes
SHA-256: eee1eceeeef133e88937b588c7a8b2e4989cb5e9d709aaeca26ad02e42813987

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