Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1e49eb43f87519…

MALICIOUS

PDF

84.6 KB Created: 2021-08-25 20:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba6905e91537cda35305fdf706b57877 SHA-1: 0de542bce820f1c6a0b5148690fe52320c00876c SHA-256: 9b1e49eb43f875190083c386171bdacd0b17ba4645743022ba2a19e442750447
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing or trojan PDF. No scripts were extracted, but the document structure and embedded URLs are sufficient to infer a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=how+many+combinations+in+a+4x4+rubik%27s+cube PDF link annotation
    • http://etalentlink.com/uploadfile/file///2021082323012330.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8322c2f21---jalewo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e74c81b8f3d---31654336848.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/falumepelesuxix.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/53091724459.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/98106131850.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8cf51ff23---nidajotet.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6836581f8---ridefiwin.pdfIn PDF document text
    • http://intertravel.hu/_user/file/4654305026.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3e4ae4b48---51401834611.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/64051681172.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/531598050972f29253f16f40dd58672a/3690701918.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/30730362405.pdfIn PDF document text
    • http://dejede.com/userfiles/file/11673113776.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kasaputazulexegad.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f3c3ddae18cc137770b054dbee00208f/jufor.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/lk452ouo1273d1reavdtek4nb6/fepopeparuguniworiguvilun.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3bfd3ad8---45754685770.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/70657744516.pdfIn PDF document text
    • http://tayles.com/uploaded/jeruvulupinepo.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/puvotudulewolipufako.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9250a0747b---27046280020.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3357cb14---57112001953.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b153805c0a6---judex.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_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 17208 bytes
SHA-256: 5f960ae425d58e97f0b488b3a698cb3ab1ce4987ada43d6f2dc5f489cc1ff92e
font_02_sfnt_off0001288e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 11080 bytes
SHA-256: 915118fceb58c3f966d9f23a6c15b18d7d922cf03cd975ed54e7ac44893559fc

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