Malicious PDF — malware analysis report

Static analysis result for SHA-256 2808ea7d168680c5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 18:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06950c0d7306272962b1378d9a8c2ba8 SHA-1: c0cf9bb86dbd739f8d1b9f326a4140c1cdd3d087 SHA-256: 2808ea7d168680c5ee06386ce5d64747a04d4ad7f7b26c6a66861b0db5e444d5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=gerund+vs+participle+pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b43d2156f---sosegorolada.pdf
    • http://reklamavysocina.cz/UserFiles/File/mafakuv.pdf
    • http://roocenter.ru/upload/file/solowomusedapufezux.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/addcc3555217599e6343582c7b3dbeed/94067959146.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bdlj78b3c5fr7f4msmbmtmatnv/45063762757.pdf
    • https://people11people.com/uploads/File/zizofaja.pdf
    • http://hncastlecable.com/d/files/21740033135.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d69c4208---4322147242.pdf
    • https://needlugs.com/userfiles/files/tomoserivokirexadugem.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/lq8hc1mdmsfchn3i8h7c1k3o37/zawoxu.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/tugamutekodigutobifixol.pdf
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/87949886651.pdf
    • https://promobryansk.ru/userfiles/files/56528753461.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c08dcd512d6661c90aabc7a14b99dc00/wenuta.pdf
    • http://adgroup.co/userfiles/file/wafafefuteratifewesox.pdf
    • https://service-panev.com/userfiles/94098642892.pdf
    • https://avonsteel.com/UserFiles/file/38216582733.pdf
    • http://mixmarketing.vn/upload/fck/file/7209777688.pdf
    • http://iktoktatas.hu/files/file/pojomi.pdf
    • https://electroagro.es/pub/files/lofip.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98943239791.pdf
    • https://calmoinc.com/upload/editor/file/tixedarutaxedukawusulunej.pdf
    • 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_off0000d55a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 16792 bytes
font_01_sfnt_off0000ed71.bin
e136ca2181ddafb35549f04eb94fd50967b41d4afeb7ae5acd83453ed4f53491
pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 10696 bytes
font_02_sfnt_off00010621.bin
7970600007d0d0340f142973a27c57d0accbc23846e34316b578b2af8585ef55
pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 20596 bytes