Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dab77c313cb111…

MALICIOUS

PDF

93.0 KB Created: 2021-07-04 04:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f1298286a694235875c2182a15c0838 SHA-1: b5e76fcf7557e53cb595797d012bf1ea337d32d2 SHA-256: a5dab77c313cb111d32c8c330735866f359d361d0973e747c69d3b39d13e0c12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicates maliciousness. The primary goal appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=michael+jackson%27s+youngest+son
    • https://daismene.it/file/nopebakilarimaguwor.pdf
    • http://blueyee.com/upload/file/051603511004.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/4187609711.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3d7a1ebb061634564a4b36ca1b303e43/jasafalatomamawixad.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/srhrnt63esdnjml6lq6i06hg97/18983472424.pdf
    • http://vimar.ua/userfiles/files/pafilotunijofizib.pdf
    • http://hgbs.de/userfiles/file/wuperutuji.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071df2dbf7fc---nubog.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6dd16ae4e5544aa3cfca75ea0c624d54/tuwuvabawojedemenaduki.pdf
    • https://vpntraffic.com/upload/files/navomozisisizemifirur.pdf
    • http://vidol.nl/userfiles/file/90872399103.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f0ced63e---tudupiputomin.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/01af10fc6813acac9f8f3fa6e64f6b9c/66127261310.pdf
    • http://bona-agra.pl/Upload/file/gamitoxibivepi.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/muruvixepizefimuk.pdf
    • http://askort.pl/Upload/file/31723605443.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bd3d4d6c0---wivasiwanikaxujujuzifi.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3049bb6947c559930fbddf638ec0c1fc/tiladejixedosololuposutip.pdf
    • http://smepil.com/ckeditor/userfiles/files/negixe.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a9a45156---bopisorilugag.pdf
    • https://softway.gr/ckfinder/userfiles/files/sigibigoluz.pdf
    • http://amadpich.com/userfiles/file/937948086.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6c82a28521a61cd133b7d975a7811212/29966986467.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_off000107d1.bin
ae5e4cb75a0bdb2cdceb307a2cd3bd7c170a16193e76480d3e63286395258b91
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 17432 bytes
font_01_sfnt_off00013594.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13594 16792 bytes
font_02_sfnt_off00014dab.bin
946dbeca7ba58e442dc4b40676042d7c8bf8c93db99444e02dd5e7f0c14d8c6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAB 10872 bytes