Malicious PDF — malware analysis report

Static analysis result for SHA-256 80178c9d3cb9af2a…

MALICIOUS

PDF

83.6 KB Created: 2021-08-17 16:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b70b6b765529f6f5926db571c3f4fe45 SHA-1: eadfbd3d2bf7a4dd52827ec53fcc21a847fb667c SHA-256: 80178c9d3cb9af2abecdcec12ca76fa1828dd84261c14a65c47a339ca2881024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as part of a link farm to obscure the final destination. The presence of these link farms suggests an attempt to lure users to malicious content, potentially for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/280f29d11378a5fe6b087f8b386c12ad/nikew.pdf In PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/udn0v3p2mmpeo0onje780v1rpt/54630797691.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/12903015225.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/xesevunesanokuj.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ub5rittid3ek0s77of0bjkpisn/visun.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210801022907.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bu9m7nheqqbc3nskl18bbv6sr2/kexanuxorifikitufuvi.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/5530393857.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/ziruf.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210617_194821.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/843f53105757b12f6dac41887321a44a/27598001717.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d9903f5db5a05b1fa1a4798ab773a2e/garofox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d17c8f37---7672433563.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/41810877846.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a9fvblg2c2kjh4800tvomjt3bp/bobibawusaxepa.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/bifugaxasuzopetozevi.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e20112b80---96983388188.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092912a9ebe8---50003255082.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608539a4842b3---jebimigopulelutibipe.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/wikofopirijeko.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/59648327097.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/697821f1a55af4408df975de3c6a8b16/60792680482.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ad3c6551---winurololujibo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/69e63215eaaa18cd6c06f2ad880c10c8/vurasumotadubusame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cuantos+huesos+tiene+el+esqueleto+humano+y+como+se+clasificanPDF 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_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 17896 bytes
SHA-256: f24a3ec5bd4c1e378f5c99dc60e8c1f76332ca32108b74507aa581220adba485
font_01_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 10892 bytes
SHA-256: 207089d220ac6e8947a1f9e0e00ded038f878e470d3c0daaed5fadf604b18166