Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b069550085271d…

MALICIOUS

PDF

94.4 KB Created: 2021-07-05 04:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e25d87af928b47dde741ba2560e799f9 SHA-1: 286e8f94335b9e4e035138e813f07cbd48117048 SHA-256: d4b069550085271d44f0725dea3ff4a2cec8229eca6a39525d15cc63f76093d6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://krisoc.ru/uplcv?utm_term=language+discrimination+in+the+workplace+examples PDF link annotation
    • http://criminisiepartners.it/userfiles/files/62697087826.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/5f915285761f55348eeeb9c8e883f0e8/xixefolu.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/badum.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/e938e6373294c2767e3876476268b4bd/wutepojifodanejoxevuzek.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/240ec09b33b8a7d2cfb3189e2c9af4c8/rosejusuxuguxupo.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/003476e647b88b4df3bd434cafb918e3/49284401222.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/5e831793e988414b53bab7543b772e76/kuvopigejerotisomij.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/34595702470.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/74496698060.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/aaa7df97efde0e7eb5848cbdc29b08de/82903258946.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927375c2af6---79205843817.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608150e873077---rupekopukisoruvurenegi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6bf6b96782ef0395438d5c33a0c50e88/kakudexizi.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/luzomajiwirepuvalilas.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/suss90pt7it48g52b31jimn7cl/jepoxipazogoma.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/denifonozusigovanezisebur.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a0eecc045f35e15d1512995759dc3450/55563111530.pdfIn PDF document text
    • https://samtee.com/admin/images/file/fojogaze.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cafec1e3a00---jegubopopuzubutomeli.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160789a07a6b52---95873416795.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/49263593937.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/35343778014.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/4756117097.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c17d0fe50b2---jowelasoxotuma.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081267aee619---gubupopalibobewi.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_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 16704 bytes
SHA-256: abb697fd43613310d97572a8dd4468e20f70542a5b6ae6147cb03da6263a45f0
font_01_sfnt_off0001398a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398A 11300 bytes
SHA-256: 507fd2667df6e2a1f2e23e30a32249711d5407a3a4d69473e8c44ff167cf19b0
font_02_sfnt_off000153c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1