Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cb58e62d2774aa…

MALICIOUS

PDF

94.0 KB Created: 2021-09-12 17:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f35cc670b51e7960861a7501c21a854d SHA-1: e6c2e28043b977fb96875fb9d94f93ed7bf79b8d SHA-256: a3cb58e62d2774aacd2582b1c46b063991ecf6aaf2d18a22d1fb071ebac4372a
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing infrastructure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document explicitly requests sensitive recovery secrets or private keys, a common tactic in phishing and credential theft campaigns. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam pretext. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures strongly suggest a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://archism.ru/uplcv?utm_term=flutter+build+apk+visual+studio+code PDF link annotation
    • http://metalzilembo.it/userfiles/files/58400226447.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/28232317331.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/487770577.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/71582697608.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1e57bf77---7313705869.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210910160439.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/rozowodagalok.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/49969358872.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/72703293120.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/90922436806.pdfIn PDF document text
    • http://autovoda.ru/upload/files/tarevabid.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/sidomolevonafegogij.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f19e56206---wakunojokegunekapobi.pdfIn PDF document text
    • https://svltv.in/userfiles/files/sozix.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/wozefuwupofitiji.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/13345998604.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/52290972160.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/98443275654.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/xagavuvurajewavag.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/46186340141.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/95092944796.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/91080722482.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/rijaxelirowepapuwi.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/37894249369.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/tiwupaxisupejivokemo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a987d4aceef6254325ba5c0f3a812e05/bilagabiwabewolagudofi.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_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 10780 bytes
SHA-256: 97b97a562ff1a033013dcbbfbdf9a3a9f70328db60023225f91b70b909965349
font_01_sfnt_off00011bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13409 20512 bytes
SHA-256: f9775daa9a3317232503af58b6e9c50e1ad2e3303e390918dfe16328a3266451

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