Malicious PDF — malware analysis report

Static analysis result for SHA-256 2332b5cc9434552e…

MALICIOUS

PDF

87.7 KB Created: 2021-08-28 22:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebf19fd24f4220fa47b868fcc7681e08 SHA-1: 8f321e35c9d18942c8fdccabdb2dd9384b8e31b6 SHA-256: 2332b5cc9434552e9bae50c6d42438d5f9a8a97748a56ef7f0825c0f63658d3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is likely used to redirect the user to external URLs. These URLs are hosted on compromised websites and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=twilight+eclipse+story
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/29602656404.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6vutceudj0rmrs4matnrv4ck70/21885560637.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075c87e283ec---kaxozavajomabumedakaxot.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b81052b567---guxedixapepevetigo.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7d891fdb17f2f806415c690024c42da1/76773434442.pdf
    • https://tekmaker.com/upload/files/90077219066.pdf
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/8895421163.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38568ba9a1---71001236664.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086009a941a3---86715081143.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cac61d1c4eae6659c8fef108b6e806c1/1144165907.pdf
    • http://akcjonariusz.com/UserFiles/file/mufusupimavosomadoxaten.pdf
    • http://mtecommerce.it/public/news/file/rirojilalatemar.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b57c88fc270c029fe0229a160039b79f/48372550269.pdf
    • https://amd-export.com/site/upload/file/venadabilumopoberexajofiz.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/17451116262.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/7b74a69df333c821ca4d1ea795faaf5b/pegobuluvuxu.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/888c0672fe65577f402e23e4cdd74c7e/rosobidokudeziguv.pdf
    • http://suriyedostlukdernegi.org/image/files/93596367006.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/m049brdtekc5c82012jkrmoqjd/94191394412.pdf
    • http://gocreate.termall.pl/upload/fck/file/jokateboladiniberibezit.pdf
    • https://dancleland.com/img/upload/file/47733956151.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_off0000f0fe.bin
d139bb910d88db34b70f6e8b603625ed411b2ad8917144bfb236ad9654fd5ff1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 18756 bytes
font_01_sfnt_off00012217.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 16792 bytes
font_02_sfnt_off00013a2e.bin
c1a26cb49f4cf8f7a90d8f63106c697542d78e11507cd0214d75430c5ca48f97
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2E 10552 bytes