Malicious PDF — malware analysis report

Static analysis result for SHA-256 27202e4b91bce7b6…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 08:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c9284dc5ef6a80fe5a5989fb157797b SHA-1: 76cfedbc7ecd625f45420e0c872660032b36cbf8 SHA-256: 27202e4b91bce7b614040b3976de64e0291e58ad82aef2bacaa7f7e4b3a3fa63
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 model as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of these links suggests an attempt to exploit users through deceptive content, aligning with spearphishing tactics.

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://globalfeedindustry.com/upload/files/19085467040.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823a9771a52---71983219631.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/702fad9c86e3d2a61fc1a5dcf4378482/dununazovanufunoxo.pdf
    • https://klairtransport.com/uploads/files/wofuziginapasas.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d67rh8c36ed5ncfaetcg2fna6/93397563104.pdf
    • http://scriptonica.ru/files/files/powupupolowexoguta.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/94484510092.pdf
    • http://razaviota.ir/basefile/razaviotair/files/63266754584.pdf
    • http://vicorsupply.com/uploads/images//files/29587794006.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609458ba5b5fd---fosox.pdf
    • https://legyenegyjonapod.hu/userfiles/files/18096952444.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/viredubarugaxibe.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/15159511044.pdf
    • http://dgjst.com/upfile/file/biwivevakovukisagatal.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160df7529324f9---52118461861.pdf
    • https://harom.ro/files/file/kikoforukazutatesiporugo.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8897d8d2fe---68342216425.pdf
    • http://pentas.eu/userfiles/file/3100276238.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e173e40089---83168405275.pdf
    • http://fatename.com/uploads/files/202108261325083067.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7519ad7de---zewakapirutodanabi.pdf
    • http://elmbbq.com/uploads/files/neruxupix.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608996cfef92d---lerozakitijaxot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=atkins+pdf+free+download
    • 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_off0000e855.bin
e768729c04787d7db974349d11f48b25cc2d2c0d0a3ee57d45543ea650db49ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 19612 bytes
font_01_sfnt_off00011a3d.bin
d4b6bab4e7759d61e142f81decf06af08aa9ecfcb9b86120c73ad5cd0f5026d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 10648 bytes
font_02_sfnt_off000132cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 16792 bytes