Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf4065a8b3de6d4…

MALICIOUS

PDF

73.9 KB Created: 2021-09-15 17:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2f1a6993dc293393ed52eca130b7463 SHA-1: 9b5182bc5ec6c87b93929bfb73b992cba3c37802 SHA-256: 8bf4065a8b3de6d49f023488c5cd422f99dde4bc265c21bf7ee49b56ae91df6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute content, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=el+abc+del+lettering+pdf+gratis
    • http://blgjad.com/upload/files/vigolaraxavok.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/l1sn9kp9bqhi96gnh4ls6fa7kp/liraxoxubopa.pdf
    • https://htchninc.com/d/files/rimedevotosizenugujekix.pdf
    • http://thermcom.cz/userfiles/file/bekijoreleja.pdf
    • https://yukkumpulgroup1.com/contents/files/57132541565.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe83cc4a1f---latomijajobifasuguxodun.pdf
    • http://dichvutot99.com/webroot/img/files/14268093262.pdf
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/45748812504.pdf
    • http://shimamura-mail-order.com/userfiles/file/62025540894.pdf
    • https://nutrishop.in/ci/userfiles/files/nusowedovokegebunadegis.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/50074e9e755263464ee9d49fa50e4628/14080924015.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/44436659464.pdf
    • http://savalis.ru/userfiles/file/96604838943.pdf
    • http://mea-travel.pl/userfiles/file/tadowibasunemapubitavono.pdf
    • http://ecohost.ru/pics/images/file/80016346771.pdf
    • http://iucecb.com/files/file/25080062646.pdf
    • http://www.colormotion.cz/UserFiles/file/56281912655.pdf
    • https://sowlindia.com/userfiles/file/89431210726.pdf
    • https://trompis-tondschungel.de/userfiles/file/dipopotukorodafux.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/116383105.pdf
    • 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_off0000bcea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEA 16792 bytes
font_01_sfnt_off0000d501.bin
23b87d7384ac6045849dda215d8e124d4aeff24993619d67a366939c78c45693		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 10796 bytes
font_02_sfnt_off0000ed8b.bin
ac39155a97beecbc7e1d9636d77ec324caafda52c07d9c684cc2bdec4669874b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 17460 bytes

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