Malicious PDF — malware analysis report

Static analysis result for SHA-256 85362ff75cc662a2…

MALICIOUS

PDF

69.4 KB Created: 2021-09-05 22:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4c3bbdf2b623599919e0bc07b5ea9e7 SHA-1: 478e68f009d631682217041e1b184774d45f0fe6 SHA-256: 85362ff75cc662a227a61d92b87e7331cba64a500d41aeb8d2f3d1b322f3f18c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged as malicious by ClamAV and an ML classifier. Heuristics indicate it's an image-only document designed as a lure, containing numerous links to external sites, many hosted on compromised WordPress installations. The primary attack pattern involves tricking the user into clicking these links, which likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=amino+acids+and+proteins+for+the+athlete+pdf PDF link annotation
    • http://bloomx.com/sites/all/sites/bloomx.com/files/liwabujikofelore.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607547ca34b15---nobozitunoxavez.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce351d3916---walununozepomal.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/bedesewa.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/vojitaxukiwenerevibi.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/1279385650.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/66364169398.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a22f330d0d7---gofejefumotalajot.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2260lelv9jr2eclk2r0g1a178t/97096890478.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/17834806746.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/20422477746.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/92117593479.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/bilufusuxikofarapobi.pdfIn PDF document text
    • http://hzqzg.com/d/files/tuxokun.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/d8e7ffe0df191face5ecf2b609727fda/42483606392.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///wagedunezeguvetem.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/50098945345.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/daa1a83c253d3c603698e63ba315ade4/99027991427.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/vevegivexuk.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f1e696b9eb999e658b300530d967f214/42233588290.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/savefifilaraj.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/gexanexunifizidom.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b6079b6b810e811a5ffe84cb69afd0bb/88532682513.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c734f43925d---1188825024.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_off0000b42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42C 10868 bytes
SHA-256: 40dd0d2e1fd1827f084c86ac387ba217e3c6b7b1edf78718f726fa51472e1edb
font_01_sfnt_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 14108 bytes
SHA-256: 66f678ae0ec46665cd90fb9f974bf7f4544ad05b82888c695871137925a0de8f
font_02_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1