Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca02057a4f6b447…

MALICIOUS

PDF

95.8 KB Created: 2021-09-05 21:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8d043570f1ae006f6979dbb369a9787 SHA-1: 6c21e203b205317b5cc233694cdf64051b710132 SHA-256: fca02057a4f6b447c46e4c1137cb282e64adef6e3b5270fd56520863ddf278a9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://pixomot.ru/uplcv?utm_term=fibrilacion+auricular+valvular+pdf PDF link annotation
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ed92b135a010b0c273016f122a4dc1a7/jabebasazaki.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/aefef074ed69da7ff4d0e633aff54cbf/puvovofatefikupadofeto.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/vubibukazakebeno.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/mewevajuzafazedujikomiben.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83167354224.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607792eee4c5e---86694134855.pdfIn PDF document text
    • http://saptpadi.com/files/file/80137484113.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/70624592879.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79b16cc8b---55587594079.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/nubudimesofov.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1bf8ab29---36361082711.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a1f009aecf698fb678de26cef292608c/tamekopotepon.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb56a255ea---sutuviwifisamu.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/piveworexuwulasovoduxo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a07b6a50616ad2b32d56c754c201b0b3/9649774238.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rrmbd655kb2o84r16t29788n4d/winadibewuwukezojafosu.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/35991740679.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2cef65ac7---83427489084.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/fudemipinigaposaji.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://alnoorcity.com/userfiles/file/wuwegivedoj.pdfIn PDF document text
    • 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_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 10500 bytes
SHA-256: c3d59a37fd05b1e6a58316c9345b52bb5c5105a789ab645e85d33eba5f885290
font_01_sfnt_off00012554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12554 20128 bytes
SHA-256: 642e3a17f5e6d047aaf3676ca5e38d0d3846fa68cada56abfadf5e78c25dc4c0
font_02_sfnt_off000159ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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