Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34ede5744034ce2…

MALICIOUS

PDF

86.4 KB Created: 2021-07-16 14:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d5b1977ce24b5ededbd3fb641ae4e99 SHA-1: d26955017e15604ee9b7585f7862c8d2447986ce SHA-256: d34ede5744034ce26e3a3bf8d7b35ab3d40a9168e1965e0d973f59cd1956390c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=right+angle+triangle+find+angle PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae511b64fa1---30461486550.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160afbeb64ab5f---77250046900.pdfIn PDF document text
    • http://talleresjpg.es/img/file/gonemopirifewonigiruwu.pdfIn PDF document text
    • https://drsaman.com/files/90949604794.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c575578752c---83471498004.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/6656485e0cbaa743732c51d3166733b0/65221601782.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082a894918c4---29671554671.pdfIn PDF document text
    • http://novichiha.ru/pic/file/sizolebunerelenodosapu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/91q5uo3j8gso4h8eekblop5mqa/3932410865.pdfIn PDF document text
    • https://amblamy.ee/upload/file/76429938650.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/29920567016.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac9390af59---kejok.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/40e8488017bee958fdbc4eaa35d43f27/disalewi.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/vunukutulobof.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210626102122.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tulinofif.pdfIn PDF document text
    • http://fedime.org/imagenes/91241609259.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/limusedesu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94d36ab00---92589526643.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bc5pqn9ld07a2fao95dv1n8hsn/dovuzem.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27989b3688---96592243263.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/c3rvba63a7mop62tofckm812ht/jifijugujuriwobu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f03d14e4f---13271629290.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160807071b8d61---mubokep.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_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 10392 bytes
SHA-256: e75f6df1d31a99cd79fa9f51322955be26a4b9361cfac27f9cf65f71f276ce1d
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 18332 bytes
SHA-256: 5531d6c389018210fc1036617a232d7bc9d03f1d3726b6cb613d09ed8af80e77
font_02_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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