Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a36a982079a1be7…

MALICIOUS

PDF

99.2 KB Created: 2021-07-27 22:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 421edd47f977816f070f36843e2c2c19 SHA-1: 4114c41b69347499604a11236a56fb42acaf400b SHA-256: 1a36a982079a1be72abb01e5adfe940c7fdfa01e53d700274b1fe6a537fccf51
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites or other potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of a link farm on compromised CMS upload storage suggests an attempt to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6097614cd---31852307867.pdf In PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/17976147361.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/watawarililedotezo.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/74388653802.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/sedidozolimazugupe.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jaxadalubamebuvabam.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/valozuzulap.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/fomup.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/nediwezoral.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c493600028---62123680511.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/52553825593.pdfIn PDF document text
    • https://htchninc.com/d/files/jekifalakigupinodemumof.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/q8cmfsgseclnq04n7sssvo8ga1/sowabeninowijejizeni.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a003294f1---lefenotopedarifibuzok.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/2a3d794d6a4482c17c2e9e0088b27636/rovegenala.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/98310611450.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/mobafu.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/90728645898.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b744d81286c---dapozupej.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/risoxudonisavewesotar.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/31745071387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=who+is+the+richest+person+in+the+world+2021+jan+12PDF link annotation
    • 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_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 16584 bytes
SHA-256: 2a090b742c3479e26d7fa49f2e2c5a53a6ee1a1f5baddfe6706d13abb40c7fea
font_01_sfnt_off00014a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A83 11112 bytes
SHA-256: 048bc1cb061342b6556e6350cde1dd1317b19812916c17f1d8b6fee621c59b58
font_02_sfnt_off00016486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1