Malicious PDF — malware analysis report

Static analysis result for SHA-256 3372450fb930911b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 01:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53d31495d67f09e2ea74c22bdac7cad2 SHA-1: c7da9bd01f98c268b2522a604abe0016b63f6c05 SHA-256: 3372450fb930911bedca10435854f98100a8cd19a50f48cf358c388538de9573
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm used for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick the user into calling a phone number, consistent with callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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 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 http://superazs.ru/images/news/file/7899582132.pdf In PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b6ed8150b8599b54ad1fb386b550a0ad/fizibib.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134255639ad2---jesolevawisek.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908095723742.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/93338639073.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/68785119347.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e55111105---letibemedutoroko.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d346q82ohme8klu7880gfc4qr4/59138774332.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/tivemepekesoxi.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/nufuterofoki.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f397a92ad---majoribisiva.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/linirog.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/15362361322.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/magedo.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/gupipo.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/77026507633.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624d5d3e9b---vuzizitutunamo.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/49077060200.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/54878207551.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/61937177921.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/62939722165.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///80946323559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=redmi+3s+kernelPDF link annotation
    • 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_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 18088 bytes
SHA-256: 17329cbd93e01307462655d2907a5cb88d5ecedb640d70a8a16f4d249878a8cd
font_01_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 10336 bytes
SHA-256: 54b3598fa0ac3ea58e91b0b9964366e670e2f2e566bc3bb2590929a0602031c4
font_02_sfnt_off00013755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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