Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b73b839ae79846…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 19:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4d8ea1c73f0650e2e224e72f162d785 SHA-1: 88f02b03c0c691c88d5cc2086562eeb58b221484 SHA-256: 15b73b839ae79846edbca72e4010d5394584fcdaa33b16a332862c07bda372a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories, indicating it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9f6ccf46d---domovedoxiwubanaz.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf618bae43---35021455385.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44eaaefd9---70609392127.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/18346072657.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/aalek6s89em9fkr0f9ncm2qsg6/45731964015.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/24393984749.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/36385417a5de2e7798174ac523b8b906/49349738692.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/48428313000.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/1qonpjdum6u0ea3aqop7mfv6j3/josorivot.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/00b61a9493039f823d54b14507e6baf9/tajobixekalirasu.pdfIn PDF document text
    • http://renovator.cz/files/file/lurapexituguzo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e37ba442b52f2b518095d87916196e66/18943557965.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/28148323943.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8b67c902b6ab3375010c4bcdb12ec5f5/durumumilufikilonalaturi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/caba276754fd9237dba594f96a2caa1b/pimuw.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/6856201546.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/cbf68d534071a399cf7169ba1c392f9d/91875904868.pdfIn PDF document text
    • http://erictex.com/ufiles/files/rologirubobuvufajuzewafi.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/doladerukikawejuna.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b4072c8e6404bfc2409976ef782a0e5/mukizitawabapabebeta.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37336e4fc5965285a03a5f7f828aa82e/dolazalowelakodika.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f0ce444ad---raporakuf.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f7b3ba087af2b2f82fd871a3d687b204/800965826.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/83045317120.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xuvukasegalozekebubosekuz.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/wasuwesenufolepovod.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/dugudufonelademikalusibaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=living+and+nonliving+things+gamesPDF 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_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 17892 bytes
SHA-256: 667ae5b6cab9ba9bf8c0bfa01396d23597f01611674945aff17cf04ea5a6162c
font_01_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 10620 bytes
SHA-256: 66fb1b57a885daf33a07cb9e3eea9fb8b7360bd22f645cf263caf76650431fca
font_02_sfnt_off00013d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1