Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a92eec8cf7c084b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 00:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dcb5030c26e5210834e88326895f5d3 SHA-1: aadd19549d49be7a5d5cdae66574ff250edd52d5 SHA-256: 7a92eec8cf7c084bc038c7fc5df5b61e4935cd41203b2d4e11e750cb60990100
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised websites, which is a common tactic for phishing or distributing further malware. The presence of external URIs and link farm characteristics strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://krisoc.ru/uplcv?utm_term=genestealer+cult+necromunda+rules+pdf PDF link annotation
    • https://cowichanmusicfestival.com/userfiles/file/lisurosamegavaxuvenepeko.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/12334183942.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/25087733420.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743c4185449---360313968.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39e9e1ca74---gabitomopot.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/87156879421.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/guzet.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d91acc322e---81150671669.pdfIn PDF document text
    • https://senhewood.com/d/files/5572142231.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/75ab44039565f6406ade5657ff271acf/12975512157.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4a22702a---30858962633.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/92077774137.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc4c3f61d---wexabobulosajuwomek.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109031237415441.pdfIn PDF document text
    • https://atl-50.com/files/file/satib.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/mowevox.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/73ae9e656464fc18ce5f522e3e0c2b96/roxux.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/22712991788.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/r50ajm393idj7bn78bu6udqho1/89496920987.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/kepujilonekebu.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/85666214601.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/acc615cd31394c1d3487c6ae872ec700/waporozuzofarovanosimot.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/wudaradejeku.pdfIn PDF document text
    • http://ligneus.hu/upload/file/nomikonimixepeje.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/u8p740cd9q7c49e01uam90m98b/fafovek.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/zukifow.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_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 10828 bytes
SHA-256: b1fa15fdaad9319fe5186c714c86edeaf0a9d77060ed082faa044e1bd2f00bfe
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 17596 bytes
SHA-256: f283a7bfa51d608b3f38a6a29765734bf64a714bf8f4d2d66ba5a54c10704d2f

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