Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cf690b452f3d01…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 20:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8869db53e31300a9c713db89ecbb3537 SHA-1: a2a171a74c28b43024fba98d065ceee52458b912 SHA-256: b8cf690b452f3d011f71df1f6d0725b31d4dd5dfa59a72e3ba0f7a974409f661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites, indicating it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=examples+of+phagocytosis+and+pinocytosis
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7675c924---17797989699.pdf
    • http://abpaluso.com/upload/file/vuxerovug.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ec2b34db---76228960294.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0bb67a6a2da02c95d59dafcece504e86/62399568263.pdf
    • https://rimsball.com/ckfinder/userfiles/files/kunusatedunizeboselawe.pdf
    • https://werbemittelag.chupload/file/68854379263.pdf
    • http://mppscstudy.com/admin/usercontent/file/52996771814.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fdf5qi4or34hgjlciaal8paff2/gekepimabit.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ac6c2c8201fcfd362c65ea0881a52594/kozilebalo.pdf
    • http://csc020.com/userfiles/file/20210622210158_k2nv3o.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c23d085a3---mutimabepojajekidukizevem.pdf
    • http://goteneplast.se/files/images/file/87743060808.pdf
    • https://locoffice.ru/userfiles/file/lidaxewebokax.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/vkapnakhmrl9f6lnpdlebouna0/jofela.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/efe1001a412933c61e807a54f77188e6/leluweredupezaz.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2f395305---32181659605.pdf
    • https://ekransamara.ru/files/dafufotosixojumuzis.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730c898badf---sujotomelubabeb.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73708a78e---xugofolepugozodeminuvogun.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16082a98bc8e5e---wenumo.pdf
    • http://alarcon-v.com/editor_upload_image/file/vosuzididixinago.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/756423cd38fdbef31a2252169a62e241/folixomexenomulopegivawu.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9523a7a6eb---28431380542.pdf
    • http://fzsvybbs.at/userfiles/file/rozozalaxu.pdf
    • http://windmill-bv.com/userfiles/files/lemetimetuxibob.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_off0000ed4c.bin
16b1b9363ff180656c349a75061247d92a093d70befdfef8ee20280e5772f68d
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 17476 bytes
font_01_sfnt_off00011b4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 16792 bytes
font_02_sfnt_off00013363.bin
914f9f25bf583c7cab92c505d5ee6d1fdba6910d87acfe7f5ebdcc039c13d539
pdf-font-stream PDF embedded font (sfnt) at offset 0x13363 11168 bytes