Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f6b651756e7a5b…

MALICIOUS

PDF

117.8 KB Created: 2021-08-08 08:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7a63c3ef08e3187b91c43fe490bcce9 SHA-1: b9678d4e6ba8bd2ad51a329e116ff98ee73ae804 SHA-256: 90f6b651756e7a5bbc4804c7ec1311077a703377c10332c74aae2be309e35665
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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://inwebjor.ru/uplcv?utm_term=compositions+of+functions+maze+answer+key PDF link annotation
    • https://producedepot.us/userfiles/files/tavebijolaporowefafara.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/tabopinotilakubu.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/94212186022.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/gudaxubiso.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/74577498149.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/43920924382.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1fe37a4315311381e5b62dad5eebdbf5/werumozunafofisizidafoxad.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/97649265934.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0bcast07d1gnccuiq2evg5b37/13438757570.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7af67ba6---65126542205.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/67743322840.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23882df07---51009749650.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/90910233081.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851fe982d6b---repakamavigixoki.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160989a9acedd0---seduwexenuzov.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f414044ff4e---98858654421.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/2dj17osppb7ke6a3v8c43289al/49524812357.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fd73c6100a654674aa68fed5fdbbabbc/9860297520.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/jepifivenuwimivixu.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/29735137684.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oltcpgr2tfo5p7gt8mdfg3b9q6/93604661898.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/nerewaj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610e76d2885a4---74380364339.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000165bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165BF 11080 bytes
SHA-256: d40c4617f2eb7e8d6bef1df44dd09a0e8f87fe8640dc1ebcf832a056d78d7f41
font_02_sfnt_off00017fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FBB 5652 bytes
SHA-256: d3a7e330390aee6c4eb4dfb31625e22e72155de968c2cfab503f169c34a8a1f4
font_03_sfnt_off000193ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193CA 20280 bytes
SHA-256: d62aeebae51863feb19fa587807202e00db3625245b2719bfbb8b2e5b80bdb1e

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