Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac59cdce2320e760…

MALICIOUS

PDF

102.1 KB Created: 2021-06-26 06:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4ed3e834cee45d3342cc96b6b5cc97c SHA-1: 0c60149c0f9baaaef83b9677ef21052178075ebf SHA-256: ac59cdce2320e7607cc22ffff2b1b02fc75a4ef28571cf57c880c7fe288008ec
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/565536508da07f1d9dea178cb2293869/bosavis.pdf
    • https://vibangnhadat.com/uploads/files/14424243838.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e77a987a5183729d51cd743f2acc7d56/bapilowovusutowo.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/293ef80f88a8e83f117697a83446845e/bojosasupemisijugapurugum.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c88e5997ccc1fac23629fc5ffda6760/18321099107.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2ff3d7af98978e08495790689e062fc8/fexitemasajugifadimijarej.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6f8dbef0---puwevima.pdf
    • http://growlink.biz/userfiles/file/85524023851.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c590de9b28---zavisas.pdf
    • https://proia.bg/userfiles/file/48195280785.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed341186e7---ganetagurebemokegodilejiz.pdf
    • https://299-45.com/CKEdit/upload/files/1363139984.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/dfa140ee1919d64b99d6794eed18a8eb/88003345327.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ppbvki975jgmc6cn4qoifci7sh/884765952.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17d3e6f1b---10876659497.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ou8ardlpiu15titd68evb8hj11/fekavegipezeje.pdf
    • http://stellamaris.cz/userfiles/92854892191.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b617506f7---58601734981.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be8ab8c0191---ridiguwoluxuvovuj.pdf
    • http://omonetach.pl/foto/ilustracje/file/fivojubudisapo.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qcchjnbc86u2hh9euf64ggt3a3/segas.pdf
    • http://monroehighwildcats.com/clients/40160/File/7237350675.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79d2d961c5---88924760057.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3815122a265eec856d5be5c33f725bc4/deragomo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+lust+in+bengali
    • 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_off0001357e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1357E 16792 bytes
font_01_sfnt_off00014d95.bin
dc82e3c825f194e57530f327cc1f16e9a79cef69e786ba0496b7f656d40fdff5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D95 10520 bytes
font_02_sfnt_off000165aa.bin
6594e60af14f29a2fa45d7280d31bcc65a9255a90f017e8f2589c4a280c9946f
pdf-font-stream PDF embedded font (sfnt) at offset 0x165AA 14848 bytes