Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e020ba476fe069…

MALICIOUS

PDF

96.0 KB Created: 2021-08-06 10:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66b58cd70264b32a8235929deaa0a3ab SHA-1: a9373a4f4f1839f57487d0df80f4990530bba8bb SHA-256: 26e020ba476fe069763fa893c5781b19bec61f9683fc825ba56cfa2262203aad
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://queure.ru/uplcv?utm_term=how+to+enter+cheat+codes+in+asphalt+9+pc PDF link annotation
    • http://www.irrv.org/uploads/files/19526936157.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/dufabozatuximixobigijus.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/929304363.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65ccf402f---78478299574.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/29f2dvrhfshh2plf2ue88953d0/raxadegizamamu.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/61489163636.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/65963f2466618bfc18b8bb88e1c103f7/jolerusazurulemunajuke.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f71e1c947787c8008097f17db385e93c/goriv.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2289dfaff---31830461671.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0182904885---tapozimogizu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/88bdaf6e4d158909adbbe3956893932c/wubovevagilalumapez.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/kerawuluzelajokugogimaki.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/a5dh788kjet9bu8l193na7vck6/99839143722.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/31928346975.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buvajonakanil.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161071e21a5c08---7408714311.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/kupafajixeratuwes.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ji57rqj09f035o0kd4f3d42epj/91450494008.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/134e24ace41f6c1d982c6b22ee220a02/78411751830.pdfIn PDF document text
    • http://aimic.com/userfiles/file/22866786970.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf58f3bc3e---28220578035.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/zegug.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/97242679625.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608197999b918---wumasumotusorabetezega.pdfIn PDF document text
    • http://artside.org/data/temp/file/timevunevedawuninobasu.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_off0001113c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 10856 bytes
SHA-256: fbe516fbe3562a845f0f6ea89152e720d369b9da43bf1ba382bbef7fe36efdc4
font_01_sfnt_off00012a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14254 18024 bytes
SHA-256: f897fbe00e88c57dba56be689c2f68698706389c922ffb0e5d0842d39ca8bcbb