Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1cf3879c7b8ac4…

MALICIOUS

PDF

103.1 KB Created: 2021-07-03 10:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a66772519616644ed1bfbeec9749cc0 SHA-1: 4bf15b00cbec4d3a1fc6d0b6c190f44383d5cb4e SHA-256: 3c1cf3879c7b8ac4a0186b28a36312965722cf52b69d6f5ce304e55425582218
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, with several links pointing to compromised WordPress upload directories. The presence of these compromised links suggests an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://altinhediyeler.com/calisma2/files/uploads/sudekenarugez.pdf
    • https://sanxuattrucauthangkinh.com/Images_upload/files/besakava.pdf
    • http://uppercanadatwocylinderclub.com/clients/877835/File/99236935473.pdf
    • https://divinenine.net/userfiles/file/lovolakodadezekimokividuf.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea76864981---67955315871.pdf
    • http://bendhorseride.com/userfiles/file/fawofeli.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a8ec52e646228a7a667b2eb933ba81b1/49816596653.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5c7fcf63688f8f9e078a82fad1e02cd2/56604943601.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a455de3b9de---84878745584.pdf
    • http://honda-vo.com/upload/file/37895228057.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd80c05cda---82055162332.pdf
    • http://mbcasc.net/imgs/file/54753264925.pdf
    • http://www.iece.in/userfiles/file/komujifeguwo.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/duvisujomutewekomimasixo.pdf
    • http://baigeleather.com/userfiles/file/dokiw.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1704863229---zalobatukesotaram.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2u41c4ogremcnpop4pglnhhe20/ninenuzej.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1e4d30a7a9f072e6b33b17ee47985494/85001652609.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac60139dd---72067219978.pdf
    • http://sun-eko.eu/files/file/77898145238.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/lvn7ss1s0hsvpn208sscoj6c0e/41749483530.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/rovak.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/76868773718.pdf
    • http://twxcd.com/img-aim/files/70677908909.pdf
    • http://besttailor.info/ckfinder/userfiles/files/19918381678.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/7b030b4c6f03c609933514243837a9b5/jinegevupufanalolezazupeg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cholesteryl+ester+transfer+protein+function
    • 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_off00013007.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 16792 bytes
font_01_sfnt_off00014819.bin
4a8cb9a3f515da977fcff1182a5a081e52c1cddc80f342d7633c9347de15a731
pdf-font-stream PDF embedded font (sfnt) at offset 0x14819 17460 bytes
font_02_sfnt_off000175d8.bin
b43c38de2290f9c170222be256a8c4a860c963c27c0bb71179dadc992fa2c0bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x175D8 10824 bytes