Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce7c38cc2706b15…

MALICIOUS

PDF

93.1 KB Created: 2021-06-27 06:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad35a9195d18b737592160dde8b6a8ac SHA-1: 836c4248a1306d993407455b333a87ff25c7cc11 SHA-256: 8ce7c38cc2706b15f4f44dda8ea4f8ced33232bd5add7e11321712d54b464ac3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that form a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://ketchas.ru/uplcv?utm_term=coed+college+meaning
    • https://advance-pack.com/editor_upload/file/sofuro.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46e38ca17---9435549716.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ac64bdb8---sefusof.pdf
    • https://mszukam.pl/dat//file/zatevufarizugimokijagidoz.pdf
    • http://acecaalcoy.com/userfiles/file/dajafowabipaxe.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210623215659.pdf
    • http://bajajsports.com/userfiles/file/73852718213.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2930ee7ac17133a7a61d6305de2318f6/roxejisu.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/8avugu1jcgr1goipllg5db5vj7/kiniwe.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607030ace1aaa---folebosomovavuri.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884010ea165---4692306835.pdf
    • http://brno-skoleni.cz/ckfinder/userfiles/files/32275309497.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c21472f57---wizimifejajulikatiwuridul.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f1fb03b58---zizoriworimuvanevit.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9bdc83cb9---wukejoraxorakoxek.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d69fac054---86657284045.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0gs1k5klsrlgefgtcjtn0e8880/minubataxesijoraxo.pdf
    • https://pioneerlift.com/upfiles/editor/files/roturojoli.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e3518e08a4eb0610eab5cea6038d7a4/32642474602.pdf
    • http://archerelectricsupply.com/userfiles/file/ruruju.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b7e2cfa6a7c225ef15de060488934551/4509084638.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/1661e0ee1058be171e13fe54b3b02fdd/76020382596.pdf
    • https://mokhalasati.com/userfiles/files/jativa.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a138e43ce77---557409199.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10a.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 16060 bytes
font_01_sfnt_off0001061d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 16792 bytes
font_02_sfnt_off00011e2f.bin
ac3b70214205b348753078b9b677d483811b24efbe091c9981ade8d88f269ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 18076 bytes
font_03_sfnt_off00014dc9.bin
f2d49f0c15c8c988a950a6667a029048d527eedcbf28dc1a6de296c28f5e055f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC9 10376 bytes