Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f9d950f11d2182…

MALICIOUS

PDF

87.3 KB Created: 2021-07-20 06:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa1e36231f0d048d066a9feb559ddca6 SHA-1: e0bfd776ca5749ec7136aa0568a86b4f74f6ee2f SHA-256: f6f9d950f11d2182032d739f831e1ed93d82344f53962ea59a18138209642d39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous links, including those pointing to compromised WordPress uploads, suggests an attempt to lure users to malicious or deceptive content.

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 http://blesk-stroy.ru/userfiles/files/50472152959.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3692075410---fuziwupamofurubiw.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc39e2c0e---wapexewobimugon.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ej9flkfqfl9vjpolo4biogl57s/94804320813.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac5feae9e---89722166101.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b1f3abd67---54345450027.pdf
    • https://iamtimeshare.com/userfiles/file/41476846983.pdf
    • https://vibangnhadat.com/uploads/files/37404585878.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8nkikst3knjps9a2571ro1ktjr/20673767662.pdf
    • http://jkphotocon.org/data/userfiles/files/pibefewafurafixe.pdf
    • http://dashoernerboot.de/userfiles/sadoxilafosef.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/nodevesumagaxanof.pdf
    • http://servmed.net/userfiles/file/sezefuliwujobisodavobo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874677aeeee---wetojipakij.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/42384094f672539bb0dc3e8628ef4f18/53804858511.pdf
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/jimesidirato.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739c48da8f1---nakafokazikuxogokusu.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a0b0fc8b695a6fd470a517a4e7248cf8/nosetobenewiwosero.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608204de7e515---55894254411.pdf
    • https://amursvoidom.ru/media/files/43066791603.pdf
    • http://apluskleaning.com/admin/images/file/13566787962.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f40b52c765---lusemifufoke.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c29461c3---68586367981.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094936c404db---54761751969.pdf
    • http://tuanayapim.com/rsm/files/55504113553.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cleanmymac+license+number
    • 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_off0000f305.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 16792 bytes
font_01_sfnt_off00010b17.bin
2aaa9e1d2727fb3b50008456246ba90fbab99d8968fd839c559b82ff4d8b4556
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 17284 bytes
font_02_sfnt_off00013816.bin
ff76dc1ae6784f73ec4fda27a44e8f89ba02cedeb730f45d338778ae1ffb134a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13816 10556 bytes