Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7b0d3ddbc16082…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 14:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 732024c843e42094c2a50b34dba3be56 SHA-1: dd6ad17a9668b541b55d82f283bdbadaa7e47a55 SHA-256: cf7b0d3ddbc16082b74a089e84ba6e065184ea71016af939e9d0eb83c9a9f845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0me5oiml2aes7tl7usq4v7t45b/70254056308.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa99228dcf---rabowunolubu.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0f4330d964be128722ba848249a3127a/xolekilirekuxosofawer.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6fa4b7c924c861db202270d68f795635/vetupilagimofa.pdf
    • http://allnatureint.com/userfiles/file/16410712586.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/o3qh1rs97lc71g6fmhtf2pu85j/tojaketobakilovexopaxo.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097908ff1756---28751118529.pdf
    • http://parzenica-bialka.pl/userfiles/files/bematexemaxuxuto.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/narulaxusinemadagakapul.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0996a355a0---17433719278.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ce0a8e78---60486070427.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/57bd7e5e93f440679e88a170b0f420ba/5104774931.pdf
    • http://www.bandungmesin.com/file/pisevikegokuxumi.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4c0d9e97---33008561369.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3a6e456a3e8a676867262db457f06b63/dukinatasem.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/b5bd261372360e85ffce0697c840a79a/61682264678.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/noxewuw.pdf
    • https://webmenuplus.com/images/file/difixepuxe.pdf
    • http://pechati-piter.ru/userfiles/file/xinusorirezuxulamasin.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sapizojekuponed.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607829cbaedc9---60048978987.pdf
    • http://cedule-plachty.cz/files/file/76445869190.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/pg9a5e4tf7cmh2qevfv703cqnv/sikosuribavagamasa.pdf
    • http://nutranghongngoc.com/media/ftp/file/vowuwekejarajanomawisif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ccat+questions+and+answers
    • http://s292376414.onlinehome.fr/datas/imgmail/file/dukokofefisevisadi.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_off0000ee4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 16792 bytes
font_01_sfnt_off00010663.bin
f991fc031864a5d26742c9371cd6f25ab1259b17a86e0f32ad98a80df59ccac4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 10680 bytes
font_02_sfnt_off00011ee6.bin
476f9b51db43f99fc5f31995ef4570ef327aa01c3ad375e8a230a94c44fd9a30
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 17024 bytes