Malicious PDF — malware analysis report

Static analysis result for SHA-256 2759b84ed1f97aca…

MALICIOUS

PDF

83.9 KB Created: 2021-06-30 22:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57656400d19dfea5447efec41cabdd5b SHA-1: c5a7ddc79c6c47a064dac196429b56890b86dad4 SHA-256: 2759b84ed1f97aca6b1fa28c7e0014e89ce2f98d9afa7824c9d0dd3e54dcf918
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 classifier 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. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=birth+control+methods+for+women
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160771cc45b63b---bumumafu.pdf
    • http://www.puhito.hu/uploads/60578647125.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085259c595dc---ravej.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/60fe28c4975b824bc2b24ccdb7f2aa24/55245715165.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61c4a7286---kodesavojuvoleki.pdf
    • https://castel.ro/userfiles/file/78568715998.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc361d5df---nelosewugaj.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c5396178---69830861202.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/finiwisopaj.pdf
    • http://quickvideo.nl/userfiles/file/xemadivukimiwenu.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/448977d0b834c1e0ac60473b48b8b7d0/16408510833.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/62efafafe61da13d4d5c05098ec7847e/32496195031.pdf
    • http://haisushitogo.com/uploads/files/31817989538.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609def0e6dab6---mebuzobafafivusiveka.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d979208174---tabexebusizuv.pdf
    • https://alihuata.com/userfiles/file/losiranina.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0c74e3eee70cffd0aa6bfb2befbfd83e/sobojezonip.pdf
    • https://terminal.hr/userfiles/file/9627703856.pdf
    • https://carparts-fixture.com/file/file/vabumipuxazudiximanajize.pdf
    • http://marcobernini.it/userfiles/files/9480666066.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/2m4cqrhmlddheeegvj3ugj1ub5/87940995678.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4089d0fe---8893043818.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_off0000e689.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 16792 bytes
font_01_sfnt_off0000fea0.bin
c6232ab6e2fdf93447cb0b07eaa9dc75dc9802712d322c9b35627fd178d6216b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 10716 bytes
font_02_sfnt_off00011718.bin
76c8829cf731c165b3e9de254cb3fb66e7466977ef1109f56ffa6dc8732bfecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 16660 bytes