Malicious PDF — malware analysis report

Static analysis result for SHA-256 392dd2a90ebafcaa…

MALICIOUS

PDF

74.3 KB Created: 2021-09-23 23:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3bb36124175ca33399c50175a1aebcd SHA-1: b46b8223535f5ea44ed4588dda3224ed06e60a4e SHA-256: 392dd2a90ebafcaa1174ba3ce0904fa427ee91ef380c0136c2d68527ad5338b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to link farms and compromised uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6aecfa5c6e53b5b1b40885c10baddba0/97550134047.pdf In PDF document text
    • http://www.fonfe.com/uploads/files/jeninowojedugetedukuzoz.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/53085549861.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/topumuseliribatelu.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/63291571392.pdfIn PDF document text
    • https://pratham.one/file/bukam.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613101b17b0d3---tozizobagufefopepimini.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/resanexekivo.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/gikami.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/92835574492.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/fgfqg71kfb502ana48mtkd7m46/84613375594.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/19257856183.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/pirajuratutig.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/ladijuzarok.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161403461b7447---rariruwefe.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/93333266672.pdfIn PDF document text
    • http://hidramaco.com/files/files/80216876554.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/pomijidagixibofefogopez.pdfIn PDF document text
    • http://prosquash.by/data/47169292884.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/dadaz.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/760aeabefc4b038f8703c585ddf8ee5f/1756223647.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/78286871779.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/93454782937.pdfIn PDF document text
    • https://petek.biz/resimler/files/kapiwegurinenujobaja.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210918191752.pdfIn PDF document text
    • http://checopharma.com/upload/files/riluli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cracked+minecraft+apkPDF 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_off0000c305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 15792 bytes
SHA-256: 7eb0c072c037d33f3f6176b6301832ce3552f4c58570b4fa20d90be4db49dc07
font_02_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 10568 bytes
SHA-256: 846c2d1bff838cd63b562926c8fa1e3e683082fb5b8705be24a68b7a19c77e7e