Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9136e8c710e41e9…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 20:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 87be9b564c339a130d90ea1fac402056 SHA-1: 8f6de0c73a4f56c1b451cc0fa5dd8e19003aa645 SHA-256: a9136e8c710e41e9c7ca97b96c97233218cdaa17742cdb585ec5f4673345c999
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple links on potentially compromised hosting indicates a tactic to obscure the true origin and purpose of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://akinmedical.com/uploads/file/30642887430.pdf In PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7a99a4c8e521b93aaa6344126c12744f/18309175640.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/sezewim.pdfIn PDF document text
    • http://balone.net/_upload/file///golorekaxofewupipavavumo.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/sopedamavijuvu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e87ff7a8d9b---borugafaz.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/rojikenepawulu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f669ca490a---83454157067.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/31bc397690a85cbc004429dd74e5af0a/genojasukojevuxesop.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/36219007776.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9dadf11b8b0d668a0333a60bc4e5b246/41324242315.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc6c1d506e---63791317155.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/065c08435d28a4924de56d3f2278a921/joruwa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/85b3362539534a7fc9034e8290a298f1/56126659077.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/58305248699.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0172bf5b55c09f2327a4bb4bfea1eeee/lodabixanafixogutaritib.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/136503af01facaf6bbb4cf0345f99514/pepuvade.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609735c05e5ff---bubosaxusetozumifalibe.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/92353987676.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/69711117950.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/tupl059mbqgoagerpf8nqm5pi5/3255137419.pdfIn PDF document text
    • http://brlairport.com/images/file/wabupupupasojaxeponamifav.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078155bbeab8---22223296566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wine+and+wisdom+quiz+questions+and+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 10748 bytes
SHA-256: 0c3cb0892e1cd97179baaba9fb7d7738746c642fb509b9f581d56912fd3565b1
font_01_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 18000 bytes
SHA-256: 33f8dbe3296eadd0a0a411439586bf026b101f45796c4cd046538ff692752637
font_02_sfnt_off000137d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1