Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be70492acb5ddf0…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 21:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22279c03b3580a9f1a207719c8aa216c SHA-1: 718a09b5aaba276b9a66f90d5113a4f8dd4c390e SHA-256: 0be70492acb5ddf03a243180bec0dec06e2e84d576ea7a634bc2199c1b99e20a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a sophisticated attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://szm.hu/userfiles/file/lopobajubefefane.pdf In PDF document text
    • http://americasbestmanassas.com/uploads/files/14265167431.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/mobiresiniwunifoxigejuz.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/subiforaz.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dedfffa27ee---10063236726.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/zunef.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/babivalitopezawine.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16120822b1a0e3---99540835360.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fajasuvuwazevezadil.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2c9009d62---rusowitigidaxedarixowiril.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/pm5j918bsj42qsr2ni4s1t3btl/87574026419.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/35001386456.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/febisixebidaputoli.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/49853741712.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/27504870478.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/86266694722.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/72766130286.pdfIn PDF document text
    • http://micruts.org/userfiles/file/xevezufozodanokito.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/20823444536.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/vixuzel.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/68233702377.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/nolesonalafosogolexagido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=word+games+for+grade+2+pdfPDF link annotation
    • 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_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 10616 bytes
SHA-256: 899d0a6dd59807b0ef96c756ad4b0aa9c8da0d454c7800526383d9e66110e235
font_01_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 17508 bytes
SHA-256: 5449763718245b9f57dcf69c41b62adde91dcedffeb8b19e67d8931dea2d112c
font_02_sfnt_off0001378f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1