Malicious PDF — malware analysis report

Static analysis result for SHA-256 424a61bd5c51d64e…

MALICIOUS

PDF

90.2 KB Created: 2021-07-07 00:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7177954584c89ded0d37b153a31792e SHA-1: 89315a6da0437375aef835fca522e2042c27d79d SHA-256: 424a61bd5c51d64e826f001f6226b551f70713f4b2372ea926235575370ffb4e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting it is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a lure for users to click through to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f7bfb7dfd---bixigazuxejapelanuxi.pdf
    • http://bidmitt.com/img/files/file/keturezu.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/guhl5bjntvtrj6t8p96k9gnkhn/bokime.pdf
    • https://pt2-turbo-j3t.com/contents//files/5503315963.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ogjjoron10qtq5utiff9dld9o6/sizivomeko.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/94a43c6cf802113181b46f41ccd86833/435734588.pdf
    • http://industrialsupplies.pk/userfiles/files/tojagawuzategipew.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/sizaramozezegipozolo.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570e24f1ba---35218911991.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/66afe6303675ef5ed966566252706cb9/56864432878.pdf
    • https://aslimitada.com/userfiles/file/62940361548.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/954c573de7445b04f26f87d6cba06152/74869830947.pdf
    • http://akinmedikal.com/uploads/file/duxulofuxuva.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d89574730---90914704947.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/fopovelebatopuwuta.pdf
    • http://www.cbs-emballages.com/upload/file/41475665648.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/98257318617.pdf
    • https://businesslife.com/content/file/suxikoxajoxupipij.pdf
    • https://feng-shuiworld.com/userfiles/file/19026902890.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8282b992a---43945605592.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01f6cd2a1---mazazupujupevupajesomer.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/namobiwunutilijewerepow.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/74aa865e067d5c2d8aedc2fc0e6814c5/kajurenopoboma.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ba58645c5a419c7a7879bfe24e23d26e/34331104016.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a68cecdec---bexobazom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=basic+employment+application+template
    • 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_off0000ff7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 16792 bytes
font_01_sfnt_off0001178c.bin
d25b4ae8b37d656ae4cc7cd172804a10b3351d42652d62cf8088e6c7e0678169
pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 16892 bytes
font_02_sfnt_off000142e9.bin
4cc4d22da695bcf7f80f6a218e10184b6b9422c45010eabb859dce279afa924a
pdf-font-stream PDF embedded font (sfnt) at offset 0x142E9 10600 bytes