Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b7eb8c8770febf…

MALICIOUS

PDF

128.6 KB Created: 2021-07-21 15:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c5bfe84feaec445ed87c69815304e43 SHA-1: 3777bb2ff9edf0aed7aa3f57eb7955c6d0acf32d SHA-256: 85b7eb8c8770febfda2f81a7de0934f04cde767a7aca43460849ecee0d9fc32d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on domains identified as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://aucordechasse.fr/vosImages/zubumesade.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/94eabd827feae09cb842ff3172d28722/17799691445.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe8ad34d9---25750905114.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/kumifazitimupudesa.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42bfe39c5b---68831800236.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/8798bd53844481f5e820987af5ad38b7/jemijuju.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e0aa7c6a1f05f769b09b66574d9d258/radanimikej.pdf
    • http://espokebar.com/uploads/files/55972254625.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607911e778527---wufizazirexovopodo.pdf
    • https://proxus.nl/file/17860978193.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/mozoxube.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b094399ef47---bivobuzibepe.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/pu9614ig5l86a9rsgdf0mjcv6m/regevikizafikita.pdf
    • https://aduanaldelvalle.com/userfiles/file/99642058769.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/24351620775.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d952614e4d7d5a12f3c62ed57594f5b0/kixipenuzofazemar.pdf
    • https://ruiguoex.com/upfile/files/2021/06/11/talamebitokubozul.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072853f1f541---xipaze.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36367779992.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/85cc6d5699ccd647fc716c200b33b2da/jaledobetudori.pdf
    • https://fallsplat.se/file/6030457458.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e898728d54be627c54f6d26ddf17547a/bimadixifa.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/4212354672.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160994d441dc6b---16822658901.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=jehovah+witness+transfusion
    • 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_off000192de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x192DE 16792 bytes
font_01_sfnt_off0001aaf5.bin
562088fb787a90abe6f37e2c25be348fbcdf7e9de9b932030fc5acb7ca539c30
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAF5 10508 bytes
font_02_sfnt_off0001c2f6.bin
d43e9810076f7b882bb073d3ddb4e62e097cb8355a8f5d26cd6ff26145ba0e1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2F6 18752 bytes