Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a1a700be5208e2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 22:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ba92e4265373e0a531be982237dfcb79 SHA-1: d55897c9c561cfa7e04c54902ee2695a1141d1ee SHA-256: 11a1a700be5208e28caca1f86667a0cc1dd50731eab3349b076d20f5ef856453
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://galeriejacqueselbaz.com/userfiles/file/xedogeluf.pdf In PDF document text
    • http://jn-zhsc.com/upload/lotaxi.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///85891209552.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139838b8326e---82319538618.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/91581986718.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/niwevijekof.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9b574d09a3a330307e0587d3d8d81758/siwetitewawuketinobubegi.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/jator.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/65230446777.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ba5e28c3787cbaca42db7577a7c42459/jekowano.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/govagunumefudafuki.pdfIn PDF document text
    • https://masihpt1.com/contents/files/2472215752.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/36798485327.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b99b7cddcb---forutosufidajowoda.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/40896878011.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/bodevoluverekat.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ctda6idfi2fqafikv5rd2nlrj7/7033035117.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/pojeserova.pdfIn PDF document text
    • https://mollis.rs/files/72475332873.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/buwokir.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/pivelejafesumowimufasin.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/lulubirefuvonikisudavevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+save+messages+on+android+to+computerPDF 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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 11052 bytes
SHA-256: f8862bb8ad882c0c20660a75ee831430ab2524c235820c60519b4059f5ed5a6b
font_01_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 17708 bytes
SHA-256: 7909d9a9ca7e346df3c24eb38ec5fdd56b914a1c1df54e36f5f118f41638f3aa
font_02_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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