Malicious PDF — malware analysis report

Static analysis result for SHA-256 f185edf390e7aefd…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 12:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce55f46548c03e4bface34c0457bcc12 SHA-1: ba530311fed9804d6824fe0cfc9dbb7abbfc14e5 SHA-256: f185edf390e7aefdaabed3c7541eb9f0e93f15ea35dccbcb08f6c416abe5d1f2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by a ML classifier and ClamAV. It contains numerous links, many pointing to compromised or disposable hosting, suggesting it's part of a link farm designed to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number for a fake issue, a common tactic in callback phishing and tech support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://villa-carlshorst.de/sites/default/files/file/46929827292.pdf In PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/sapukawamuzijeremoka.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/lojuja.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/zafofipaz.pdfIn PDF document text
    • https://stotex.rs/files/15834655697.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/bemenoxafarusekam.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/23764656644.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/tefigulewik.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/vewelamiwi.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/tetanilevo.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/28532922523.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/1729392703.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/88650782971.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wikuzobofexuloda.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/zurokodugizowidamanifeko.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/99238846472.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/19116173321.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v7lla88bcvnk6da1be0m5d53f5/34650987870.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8nm3364blim83ttejk605cef7u/fudotubazufemebowisu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613700bb5cbce---temugenosefap.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132493476f34---25653417146.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/ginowitu.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/sogesusuvob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cheat+codes+for+gta+5+xbox+one+numbersPDF 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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 17272 bytes
SHA-256: 3d40b079aad9bf30756a7e03f73f6e0bfb8eda479cd7369359924261adbf91e2
font_01_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 11292 bytes
SHA-256: f7ad0f47fa3bc05bb6460e462bf582bc299255729e419f2f94089343324062c3

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