Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e71914551fdb8d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 11:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8753f10b2d52e9543ed1ae6fdc154582 SHA-1: 9a4a015e643cfa358e5e8bca232ee1d229871ac8 SHA-256: e3e71914551fdb8d39b3295ca96c7f2818c6eb73195eb420a2b0e29b2cc65cbf
216 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of 'LOLBin token sequence' and callback lure heuristics further supports the conclusion that the document is designed to trick users into interacting with malicious content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=genymotion+for+free PDF link annotation
    • http://minerva-collection.net/files/files/tefasiwajivil.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/nuvuvazemakepabudak.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/pawozorofufa.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/giduxowedirixunisojile.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/981375b26f465541720d2f0ac965683c/3760910765.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/3nqham0k8k8dn21osaf16ni01i/zurubop.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/tejoxaramanusuxeg.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/51206174366.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/lawevapifilozasulige.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210915_216A13B77D7909F1.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/lededetujinulusujugo.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/gumadakase.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/bozakew.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/46861974625.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109191820156593.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/9525171228.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/19756358169.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/98170814365.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/14203810840.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/69415656195.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e4cf7c103eb0c36daa2f3ec2da47bc82/lutozuzoziva.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16309137881159046281.pdfIn PDF document text
    • http://qdcmd.com/data/files/nipolo.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/29298513791.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_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 10152 bytes
SHA-256: 8d92d2bd6bc20d897b5173e80a268c2d646ff4930bb130b9e43b9e43e71b006e
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 18072 bytes
SHA-256: fb06d694a0ae9d4d7040fd559e401ffb39f75d74b65950d31d727cec5dee8c1c

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