Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb3bc0f844bb4ae…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 20:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 375c081a9c57dd94b6ae2944567176f3 SHA-1: baa72d180ff673179d2af3fffe5de09b848078ac SHA-256: 6cb3bc0f844bb4aea8e5206199dea9667abdfa772bf518e11b2c0ee5b5e27e87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports a malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=t%C5%82umaczenie+zda%C5%84+j%C4%99zyk+angielski+pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eafd6d8eb---zafer.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/57efe3059f818acfc38cf5098e89f047/dezuredotedemizevipadale.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16077273d44d47---85521933926.pdf
    • https://www.milestonesmn.org/ckfinder/userfiles/files/kesarotijidalitevini.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c783f5d512---99997259833.pdf
    • http://zdrowejaja.com/Upload/file/japabilutazomam.pdf
    • http://ondrejkocar.cz/img/file/loxuwitedonupipoxasaz.pdf
    • http://riph.pl/userfiles/file/naxinigepikodif.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/91909596226.pdf
    • https://mimpiindah2.com/contents/files/50600008246.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2494722e4da7d16d70fc381ab2114f80/fasakubalo.pdf
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/97707817536.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210620/172744425.pdf
    • http://hifitness.hu/userfiles/file/vusifokokizoja.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c1f456feb79de172905ab75a03f53cd4/96884529830.pdf
    • https://an-professional.ru/img/files/file/43195271012.pdf
    • http://aivieksteslaivas.lv/userfiles/file/18621984075.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b066f8a2480---11139180930.pdf
    • http://starcity-vinhomes.vn/app/webroot/img/files/muvapikufosijubodes.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083682d65a3e---22819372783.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0b01f6fd686eb9b47b8291b61fa41138/14592636352.pdf
    • https://nffcd.org/userfiles/files/90085210486.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1611035d83f1fb---85814902734.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f207a662510b8d1076de1ebbda723bbc/66573625426.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcce.bin
fe699ab2bde1f8f58929c2d404da727c423fbbf4acc754007730bb46f32b942b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 18112 bytes
font_01_sfnt_off00010aad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 16792 bytes
font_02_sfnt_off000122c4.bin
c917aa7dfb8d4440fddbf92d2e74471588de8d964620e014e088cfc8a7a14384
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 11504 bytes