Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea31ffcedde35c44…

MALICIOUS

PDF

89.1 KB Created: 2021-06-17 01:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d06c281b31b06841f29d641f55824b2d SHA-1: c3e882ded8e6062a1cb8d834f2edc6951692938c SHA-256: ea31ffcedde35c44c2a385728ee0fc5e04a860006e5020690151d1bf4e95bf31
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link T1553.005 Subvert Trust Controls: Mark-of-the-Web Bypass

This PDF document exhibits strong social engineering tactics, including instructions to disable security software and execute commands, consistent with ClickFix attacks. It also contains numerous links to potentially compromised websites and domains, suggesting an attempt to lure the user to malicious content or download further payloads. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://wastran.ru/uplcv?utm_term=activate+windows+10+offline PDF link annotation
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab0fb3eea---rikisomaxaxaza.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/62754556989.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/55726773209.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/84397422625.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/o426m2fsi0d8i2fo90cgt6per6/sunidopuxipe.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/26928456489.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb2fe2173---modonivuresatagofuk.pdfIn PDF document text
    • https://seripin.com/calisma2/files/uploads/92870647103.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/nidaje.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/29621608613.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/3d85d2cb431f64c8b57f7e8ca8c777db/sudivitigerutoz.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/setaruvomejixen.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/vozefev.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/62002578815.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607708d5cd085---jasedinizevugova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 5044 bytes
SHA-256: 6272d2845c30e60e72db8516304fd60c14efab8d5417793161390fca2d81c2b1
font_01_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 12400 bytes
SHA-256: e220b2db674634eb6aa988c85d66ab4ad96682a226795d7e4312a2661e8cbc32
font_02_sfnt_off000147cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CD 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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