Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed2ff1146f0f399…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 23:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51deaa2c7b97b360e63f7a35430f5fbe SHA-1: f58ea250a5a5fa7fc24ae8cac6cc3f316389798c SHA-256: 6ed2ff1146f0f399ee1b85687f04b79a3147f42100225ff5b1ab47122cbfb137
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=artificial+intelligence+notes+pdf+for+mca PDF link annotation
    • https://agronlogistics.com/userfiles/files/23897010114.pdfIn PDF document text
    • http://artside.org/data/temp/file/32740742503.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/89177983504.pdfIn PDF document text
    • http://reclamesticker.nl/images/uploads/file/80330086264.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/diranuwikifotugabubo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bc97713f5c6095d6e31fe50414bee364/38669771430.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/862aa652d5dde6bc4e96b106ce5c4b93/wexigib.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/44101253079.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/55913c4315d69a45536874879eb33c52/13785494569.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160774fa8b3bae---mogatefesaromimane.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947a13bd640---79188424791.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/330bf4ce9652442bf70ae7b04d76f9df/rivutobo.pdfIn PDF document text
    • https://ksboutlet.com/file/files/dovujagemoridutura.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0fde3a43---jajugezoxerezup.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pebakewa.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20218242313282979.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079a66467921---51758854421.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/pukasosaj.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05de05c64---63622287082.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e69a00e4ec---fedulejufemade.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/buxewama.pdfIn PDF document text
    • https://invest.pl/userfiles/file/38961092171.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f8f7aa4cc94090b451bc3ac29b5b28e8/tumusepakuzafo.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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 17924 bytes
SHA-256: 08fdc3e8aeaa429bb7b5dac399efc8be3a112231dff044952142a4a96e537060
font_02_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 10944 bytes
SHA-256: 30a65a3fe7e54b2dd88f2cb7bd4390216ab5456817ed9c20b6b4a3d90864fa11

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