Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06bf30ea5db06a3…

MALICIOUS

PDF

84.1 KB Created: 2021-07-18 11:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d3a50454b6ba4fe4fe8f6c71aa8a86a SHA-1: 05cb3250c5218dd231566dcf41e3daaf1d2ccee4 SHA-256: b06bf30ea5db06a31c2f07fa10368e6b8bb98ef44b298ff9994a473ca4a9d27e
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ambvet-trefontane.eu/userfiles/files/87630785555.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/38392896384.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43baab3f43---11928735671.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089217e9543c---57177437236.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/162e343dcdf0883cf426229481d05c3d/70432490382.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/o8utt5qql5u6e4t8qavnqr2cdh/danewowekilafalemilabuxi.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609609f5ef1cd---99934204108.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609073450f6e7---gakiwi.pdf
    • https://permargi.com/files/galeria/files/nazesovenowulejenob.pdf
    • https://pcparts.fr/ckfinder/userfiles/files/jevijiwidapubasujavi.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d39da0f7f---5975128374.pdf
    • http://malbreil.com/userfiles/file/54578635026.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/pj8i1322u8g368rg33i4fba3n3/19755307960.pdf
    • http://xtra360.net/campannas/file/34197833680.pdf
    • http://winso.tw/userfiles/file/76534718088.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c565b05c2c246c5e60ff0443241e3628/rofelofejevib.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d4d588db0---lelinitonipuviv.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/78081480056.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/580bf5e0aef8fbeaff71991796753bbe/15197388065.pdf
    • http://aelma.com/sites/default/userfiles/file/sijowajudewezuzimikikoz.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1fc9380464be60b051b296cec7184195/13177361513.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbdbed691---62744407824.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874753622f1---bifepi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+resize+pdf+mac
    • 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_off0000e4b1.bin
e61e775cc926e21404b8c34b98e089831b5bd88edad6f1c0337fd34bd9d16c51
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 10768 bytes
font_01_sfnt_off0000fd9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 16792 bytes
font_02_sfnt_off000115ae.bin
f10dca955a681fdf6e27a8e13bc13272008cf1ab4e4fccf81d40b8df35f79a91
pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 17444 bytes