Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10d1ffd962ea475…

MALICIOUS

PDF

78.2 KB Created: 2021-06-16 22:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42efd180aaa8264d132dc37a895ed1a0 SHA-1: 6f92b3cedd998d3512e99b4288fc9396eb16592d SHA-256: b10d1ffd962ea475cdd9e43603ca8a1d7dffabd9ae4bd83bbe698f8ccc52940b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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=on+bts+song+download+mp4
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f31abb55d---dogif.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/8c2n6vc0f2u17vb3333l7moof2/pipusutanaveminav.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a268fed7414---xovekefime.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ef969df17ccc63d156c827e79ee236b5/7780488133.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ebd605828890b39c0bf5e34b71aced0d/sigajozav.pdf
    • http://jngf.cn/files/file/8528160829.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/18973622657.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd742ebed---lafinure.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2v5qk84nkdma1osuj9glpft9ok/37904311545.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082bbea386da---68110316331.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e992be98---61779853591.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984e552054f---megunexuwa.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/367fceae6a775398d855a3867b7b1c74/51759294934.pdf
    • http://lateonsettay-sachs.org/userfiles/file/14286251913.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c839abbb---4932245829.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f1.bin
a6f50c84d7ee8b9c057e978d023f88ed54f29ef19e1c101bb280bcfba1f398ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 5532 bytes
font_01_sfnt_off000105c2.bin
f13c38e49033e63e8d94f2d241ad323e76afe8d1a194739c31ce201e3efc56ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 11420 bytes

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