Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a8dc610659628f…

MALICIOUS

PDF

96.7 KB Created: 2021-09-16 22:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cedadf21c39110675ca4479ad7dcfbc4 SHA-1: d6e54c1cabbbcd00b0624510d743a1f9860d4013 SHA-256: a0a8dc610659628f14dd75bd6dee04f8825ee5816907dad10de60170f2df07b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are designed to exploit or deceive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ajej.pretty-match.com/upload/files/46888507155.pdf In PDF document text
    • https://catbasailing.com/upload/fck/file/55344922272.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/51291310161.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/tukiperijofimumarejalogor.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/38237468116.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/rifijevutidovukego.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/27108352169.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/rejefekex.pdfIn PDF document text
    • http://na3.it/misc/file/binolaponotowotifa.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357d9676b40---69194985251.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/65907309830.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/futitojiziv.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/70721180133.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/47498247417.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a1f668cad47acd0e0de4ed0fbca756a8/65474394287.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/16274680027.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16142bdfe9d315---26525606401.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ctda6idfi2fqafikv5rd2nlrj7/7033035117.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b3f93073306db314c662bcca4d7b873/35711970594.pdfIn PDF document text
    • http://nprofit.hk/userfiles/givojij.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/nexinowuzedufuloxejez.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140758ea530a---28081658663.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/95406649263.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/sagezizuvopepusenoz.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jumosorapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=power+blade+nesPDF 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_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 18276 bytes
SHA-256: 73bc4c16d7c2f3e530c9bd15c6d6440ec09dfe9380fb7f05e55de7f4696ccfe5
font_01_sfnt_off00014627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3E 10276 bytes
SHA-256: fdcfeb13996fcb7258bc336d40ad4e58f9ca104ae725362d0dd920a9c36f5b5d