Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b8fe9cc37c11f7…

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 11:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51370fca9370af74d594be00afd614a1 SHA-1: 1b189587dab18bd7bd98ebf0be9334e6c762fb90 SHA-256: c7b8fe9cc37c11f7242eb7e80c72dd7a532a2a53ff462f7c77b976c25912e0d5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a730a10fb---36472619759.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/568016f6b41a8f8592fa21808c3abf58/75162676195.pdf
    • http://hurtmar.pl/Upload/file/zovoxojilosa.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/26634332608.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a334c9951---67020922247.pdf
    • http://ngocvietbungalow.com/upload/files/10647652022.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/geqao7v16jdoc6pghkvvudbku7/mobipilofuf.pdf
    • https://n-v-v.dk/userfiles/file/60098635932.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21d64ac12---80012191013.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/70fe7931db001c3992f7cce4af076d6c/65557905597.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/pt4ltl74ogmukdimtb57iutkvl/52591644165.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa99f237a37---69217017843.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dbcda411b---lomavonufarifekobupade.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607860d81012c---47389941771.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7798fd867e---paluxegidekenuzipipa.pdf
    • https://usdcp.jp/user_data/userfiles/files/31503902694.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b10c94d69f---dunoredi.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ckq69vjkgnf9ficd4dfdfiqhr0/28630443219.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f7f4c45e161dde77682fb1b4dcf64e1/12192906423.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b7206083---29028262039.pdf
    • http://verypool.cn/images/upload/File/86134646832.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d987abec88e---56943976323.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xekesulatakodezimadarijo.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b01e80c6fca---73166516160.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hypotonic+solution+isotonic+solution+and+hypertonic+solution
    • 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_off0000eda1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 16792 bytes
font_01_sfnt_off000105b3.bin
2fce7094f71c93ace3373a6f481e0a43be7453eb49a277789368885949e49324
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 17096 bytes
font_02_sfnt_off0001327e.bin
638f9326583576569300fbc4f7de8766dba0d9c0df3a6d3666455229e3512f5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1327E 10816 bytes