Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0dfd23bb2e3b160…

MALICIOUS

PDF

92.6 KB Created: 2021-06-30 02:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa047b37cfe0d28e06cd07f30ed9b68d SHA-1: f77679827bdda95f0ae092139d47964da9b36564 SHA-256: f0dfd23bb2e3b160da278a200cf8c71358af4646ef2756cef08f84e2a54e5c0e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The file's structure and link farm characteristics align with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://bscsaoner.in/ckfinder/userfiles/files/3695737683.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a61244eccedf5590e950ee02dce93628/fipunijupakame.pdf
    • https://clickkedai.com/userfiles/file/xigilikovuzejemalajexan.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/94e8e54bc60b6c264a6066b57077673b/90285603495.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210608_A5ABFC2F8C9B8EDE.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609240e020a12---xapunovevizagefaren.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd4114394---fukoxi.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ea2a3d6c---55594486446.pdf
    • http://quatanggiabao.com/images/uploads/files/botibebopo.pdf
    • https://michelbarbot.com/upload/files/9913823095.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1e817a2f4---96774812986.pdf
    • http://navigator-nsk.ru/userfiles/file/3413061883.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160962268db787---meloximaxuzi.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832fce523fa---26023193116.pdf
    • https://casabresciani.it/uploads/file/37808567631.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607215de3ba61---3427634371.pdf
    • http://a-kamen.com/userfiles/file/64206554665.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/fsbq2c8kobmgk8vp18j6lkd3v3/54789741327.pdf
    • http://amctop.com/board_data/editor_img/file/202105191935.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ksomv6furqjm4s44pd7n55j15o/zuzifu.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/s4fp26b0rrc7gk9l8b7fcmeduq/95039976281.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t28l0puld2n8200bfrgb58458h/66960058918.pdf
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/rafitim.pdf
    • https://rachelrom.com/rescontent/file/66539351584.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=36+questions+to+get+closer
    • 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_off00010845.bin
ab0683bce99c4e613456529db6968ebb80fc44947fa96b46470fe9fa960549ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 17116 bytes
font_01_sfnt_off000134be.bin
23f559b04907054914da303bb9d9c2cd2cbbe648392a8fd0e6a78236046124a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 10732 bytes
font_02_sfnt_off00014d3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3D 16792 bytes