Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00a7690a746dc91…

MALICIOUS

PDF

72.2 KB Created: 2021-07-02 23:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0de2ebe2b60a215cac31919e542ff013 SHA-1: 56d367f28f91377cf1897b25f294869e9aaa1d04 SHA-256: f00a7690a746dc9176dbf7b0219c6720206d4bb8daec52d12183782097d1131f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are indicative of a spearphishing attachment, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=difference+between+autotrophic+and+heterotrophic+nutrition+class+10 PDF link annotation
    • http://thedreams.cz/files/woxisumoranewisugibisoki.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/87174158694.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801494488bf---fejikowadixezuvosovitula.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160842647bf7bb---fonaxefi.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/73451321982.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/dikaz.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/617tu68g3hjs7gvbs601drbv10/fedakakubateropomopapisi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/uamtk0hbnii41ts9iscet38u6j/wojixojikovumageza.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/41266850727.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/norilebarofapebuwawem.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ho0fagchrlcs3of79r2t3ci01n/pirovomakiranijisobitu.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/622aae0de7b728fcc3aa9c40fd84860e/rilogekavukujisuvi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd456b963c8---pevexuxokinajeg.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/tg9c24cvupmdkadvitjnde0si5/38659538632.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/40dd4489ab5275c0aeef465a7386f46f/kuzisijawegitezil.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/kulafipabagizetazog.pdfIn PDF document text
    • http://ktcz.eu/files/files/60747197922.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/69250816111.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/7a8c15bc7882a6363302070f8597f94e/40235691366.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3b337ea2e9c6d833516c964e23bad92/liluwijuforotesedej.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/sedttf54sj6eopb07hjojof1v2/lunof.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8eb77a4487e8f4d60658b83c30c8e633/24506925708.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rblf94h629apfnk90kstbq1g25/duzuwomop.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/9918cf7454b00b2679daccaac33e5ce5/duzesekiliritam.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_off0000ba92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA92 14980 bytes
SHA-256: 7883bde01cf0bfc88a86a4a7d11236f609d84ce90791a5c5d89f81984b2d3969
font_01_sfnt_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 11220 bytes
SHA-256: 226911f1104134b3e50b4a29a798be7e3ddfaf4a7d0e7bda29a53f986852e708
font_02_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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