Malicious PDF — malware analysis report

Static analysis result for SHA-256 622f13d086676598…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 10:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d21ec3ff35a183466576d98cb181f7e9 SHA-1: 61109c5977b286e7b08d210f36b6251e6326efad SHA-256: 622f13d086676598194e00843f82261d029b1b9e253656b52632026938c07fac
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=alexander+the+great+failure
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bfc651ed9e03772e237af63304e367bc/5769120117.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728f1c7b656---fojevimezorekurukamozupab.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/cc8b53ba3cb1abfe7fdecf987a39d83b/xejuniminikivirepufug.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c7a512293---gopexuvujobamevuwopogojo.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/43949421994.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6b8ff18a7bbb4d3eb142777587a72ed8/8853542103.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d98f0f1370---88960383389.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ba098cc51accb253d49a51a8e82a408b/63689340650.pdf
    • https://myphi.biz/nbloom/fckuploads/file/nubumaxorujepimiximeri.pdf
    • https://amatnieks.com/pictures/image/mifabibep.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca3d7d444---gedawolinizogimajitonone.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074813e55026---gewobirinunevexe.pdf
    • http://barcelonasixtytwo.com/userfiles/file/25614087270.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f261b42cc5---fezupogemobejiwafarulo.pdf
    • https://artlabjo.com/userfiles/file/63084477218.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/b31o55iea0e36sp4qt1447k6h4/jaxemakebelamo.pdf
    • http://banghetretunhien.com/media/ftp/file/49600505557.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99fcb37e17---zeponoruxuwopiwadazoboxa.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb9c126c43---dilupalunofamiza.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/43jvgc12pqogp430mdb0pv9n09/zobapu.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/12b7b90acbf137b405aa4899acc70197/busoligimizakul.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa3515450---17666408160.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_off0000ec4d.bin
492a5b2d38fde65d62c5ad10b5fbd4a4fb53c7cb10b3f36e093da5c7aeba2dbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 10528 bytes
font_01_sfnt_off000103f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 16792 bytes
font_02_sfnt_off00011c09.bin
69bf04d9ba713c1806a6c52fd0438232e823e49d084f8083ecab72df58c6b182
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 17172 bytes