Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e73a3023cd012a0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 05:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9e7ca96dca71d2f3d5be76df595f342 SHA-1: e23462de3f195fcd2ee3e9d200e2a0f089f1a7bf SHA-256: 7e73a3023cd012a06eaa62e2915ac1dc2e51e28f51549585e798def2ff958f45
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm and a callback lure, prompting users to call a number in a context related to billing or security issues. The embedded URLs point to various disposable hosting sites, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://laborke.ru/uplcv?utm_term=glengarry+glen+ross+streaming+vf PDF link annotation
    • http://pho32shabu.com/uploads/files/66443430978.pdfIn PDF document text
    • http://epmachine.ru/d/files/23662901800.pdfIn PDF document text
    • http://irinabailey.com/upload/files/71984723896.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/xerurideli.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/guruwojagumerefaluse.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dfacafa2f---zuvuxagowilinagofixefiw.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/wejod.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/tafekabogutone.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/gujerofa.pdfIn PDF document text
    • http://kco.su/userfiles/file/madatuk.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/xirezavowak.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a21d93b04---77555452709.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3ff8cb4e6c9fa2f768bc8460eb4c510/33413747198.pdfIn PDF document text
    • http://x-mobio.com/upload/files/89914484840.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/norewa.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/i1ld6o8ibpnmpluk0jdf7ri0p4/79254911376.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/tuxibudexitizoduwawivis.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/99235180377.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/21294430263.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/wotusaleweganomolepo.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/kejupoxem.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/wisekoxebifi.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/kexek.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_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 10776 bytes
SHA-256: d6f16fc6ff9aeaf2fa732966e0e5e3f83ea50e0f3b9b6db07568adfc2f02ef6a
font_02_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 16856 bytes
SHA-256: 55ae49d65509cca49af97ccd2227be6ec7417e4e200e4d8e9b874001f750d863

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