Malicious PDF — malware analysis report

Static analysis result for SHA-256 6837dfba1b05d9a6…

MALICIOUS

PDF

91.2 KB Created: 2021-09-23 05:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df7aee05cd6c6d247c89c08fba9177b4 SHA-1: c3a06cbf6b833d0a0390e94ff2efd7fe2dced4cf SHA-256: 6837dfba1b05d9a681e30aa6032bb0ed931d1f76c674e13670cc4610944640be
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://1night2day.com/UserFiles/file/powozi.pdf
    • http://usa-ex.com/images/blog/file/30520541976.pdf
    • http://geerhannutpourreussir.be/docs/upload/files/8165745402.pdf
    • http://tlca.com/Content/uploads/files/kuxuwavosusizoj.pdf
    • http://movediary.com/userfiles/file/juzerurojuduvowu.pdf
    • http://abwcrainhwy.com/uploads/files/bitomumanafufixazibu.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161477e22c2c47---povejevogel.pdf
    • http://hagelkonzept.de/userfiles/file/5241412313.pdf
    • https://rmduncanrealty.com/userfiles/files/vipaworimujarabelajevaxo.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c644f29f---29457091157.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/21624135688.pdf
    • http://hrdiborice.cz/erucom1/files/files/vimokinatexosagi.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/tigivofusafexe.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kabowixilijuxelux.pdf
    • http://theffirm.com/userfiles/file/pukawalusebitadopibo.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/23crgpi57cb8hlrqdofuv1cpfv/51175884418.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ge1tm940m220rm568v5qd41vsb/dafumeforineriletuvu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8ec5e2d1---47710462441.pdf
    • https://svenjakretschmer.com/ckfinder/userfiles/files/bewulivatutelera.pdf
    • https://gsacademy.ge/uploads/files/zogubututigorotepimizopog.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613295711b69c---pojunu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+german+grammar+book+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_off0000fdf7.bin
3d7a10baf211cbf6a83508c840f2bd07dc15e6600f5adf356d332be845f8b695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 10644 bytes
font_01_sfnt_off000115d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D4 16792 bytes
font_02_sfnt_off00012de6.bin
68a8f656d9bf879628c4c9baccc4d4e1bdc5d2f039611add5591f9f90cc13f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 19092 bytes

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