Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8eaaafb2b1c0d96…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 16:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 00cff99d2269bed61da41761f689d4f5 SHA-1: 15fd89f9c5c3a63f944e2ce0e6aa8f3431920c8d SHA-256: e8eaaafb2b1c0d960337409201a6f53204fba2f999ffa45fee18efbee02fe7fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content. The primary function appears to be acting as a link farm to distribute traffic to potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://stef-nancy.fr/upload/document/ribugabowejasaxoxisekale.pdf In PDF document text
    • http://drhkltd.com/upload/94888677561.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/nixefuxegazup.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/46069723215.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/3dvj531ebce6adqrii5d33ld4f/vaxojuvapuxuvufazudazan.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/dezidojuwezagomamu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4caqbkoc068i89uvrotttjsplq/4888702386.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/limidozotepiduvafukatu.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/69673691991.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161289a4933494---bizifobojiligug.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc515c7df---risejaramegisedudi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b4922fc8---13962086299.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/26d6vc2n4e1p9f2hc2qlp1elon/19800804807.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a39c952cb2---66439347535.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/43369163377.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/keroferezubesivulono.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b3973ce02d4---74063153130.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/81312936205.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/62690949655.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/bofasegomuraxajesagadab.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/bolaz.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160769f48b2728---jogolabimovamewan.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/kifare.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/67455372036.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/31859387289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=managing+organizational+behavior+griffin+pdfPDF 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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 17824 bytes
SHA-256: 59c4566273a9bdbf4dc771a09816f314a8b22ca6156573bb69b10d9e19f5b18b
font_01_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 10868 bytes
SHA-256: 3060f0929f817b37516158f8d8c54b6c7b747c843c49de6fea994c9d7d88c144
font_02_sfnt_off00012251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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