Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c47f7b34126b20…

MALICIOUS

PDF

90.2 KB Created: 2021-06-08 15:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8328e4f5b6438e69ff6ddaa501680f0 SHA-1: b6073f88e37e9809e930c9d949b4195536760656 SHA-256: 91c47f7b34126b20afb536e10fb410977916a1ce1ad6a82ceaadb7b0ba3a2538
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=conversaciones+en+ingles+con+adverbios+de+frecuencia
    • http://ccforum.kr/uploads/file/1621651032.pdf
    • http://omonetach.pl/foto/ilustracje/file/jakakidofup.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63c6c61dc---89085447297.pdf
    • http://dwhs79.com/clients/15834/File/waxabenofisegozebego.pdf
    • http://podiummoda.ru/userfiles/file/33144501796.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/lc05hes9927scnherr1qp34e6i/jomigo.pdf
    • http://wskinbody.com/data/boardData/files/92927041125.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/22f3f92a85bfbde1f1b4fbc3b8228253/sasevojisupofuzupawa.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce2f27453e---dixulubo.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66efdf36d---55990932194.pdf
    • http://akinmedikal.com/uploads/file/97905977180.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfafb7055---40180072508.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8ecca420127fcc9edceda6b522d57eec/78846508901.pdf
    • http://compufoxmail.com/userfiles/file/8036707609.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a3de0c0964728f35e5b25a0fd8f098ff/12594215317.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b4e4e5b032516e1a9f2a72e9149f0d9/pasiw.pdf
    • http://nadiadsa.org/userfiles/file/tuxokirev.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/c19jkbqileqfbaoa40kv7od8e0/97247778021.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083eed8dc556---lefewig.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e95.bin
b9bc17674214209653efe8fd84fa9500017d8de4c9bd0c599f823883ed2508e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 5292 bytes
font_01_sfnt_off0001209b.bin
800c62f52cdcc0d6913898fea08b961056553a12b964b2b587e5fc78befc0c01
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 1672 bytes
font_02_sfnt_off00012902.bin
6f67b9e593c6b5bb7387afed5e5bfa7b6f4eeddfb822e15f27b030701a793a49
pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 13324 bytes
font_03_sfnt_off00015293.bin
689100c86c1bb54234901caadbf879acc7072a18073971f7649a895dc6950800
pdf-font-stream PDF embedded font (sfnt) at offset 0x15293 1760 bytes