Malicious PDF — malware analysis report

Static analysis result for SHA-256 c586d12bcfd7636a…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 13:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 192f094f0242b7d10538b1885d376d25 SHA-1: 69291915680d0a66f2cce5a7271a4d47bc396c64 SHA-256: c586d12bcfd7636aefe53005b5f59a789094a8bae7218dbc432cf56642b1ceba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure and URL patterns are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.myosiaffiliate.com/199trust/img/file/xebura.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/98a8cb0e699377e7656ec333c7595ea8/56540114931.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11b79e5f44---fesuwub.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8aa180923a4f61af4502e902484ed915/sexasepoviked.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7dc6857d478d8685c2bb153d74030eee/28847538837.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879d7442703---vedurogevupejopojaw.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5be78bb7b---neraxilafu.pdf
    • http://fsoa.cn/userfiles/file/39982076498.pdf
    • https://masini-de-ambalat.ro/images/userfiles/nafax.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6168d03be55e266c94b92a3fa6798129/diwupetijogego.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ffd44e75e---keboxinewipelufaworeva.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdabd169dc8---jewaw.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919bbb6c00b---midaj.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5eb6f43986e627d414a71a3cc5f80626/43659097546.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89cc75bdcb---39330548249.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d450d2538cf64533336438b90cfdae70/ninebomigotiniso.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c49bb9842e843c66ebc5257088553c2a/36174536016.pdf
    • http://optikametuje.cz/userfiles/file/judeferobelatazefofe.pdf
    • http://cn-junsheng.com/upload/file///20216333327064.pdf
    • https://sca-kc.org/scauserfiles/files/tufanagib.pdf
    • http://goldnumber.info/userfiles/file/rofifakevunutatinevig.pdf
    • http://www.rannatennis.ee/data/upfiles/files/dovolafetupawixawovo.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d644b5dba77---jekijogewi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=past+and+continuous+tense
    • 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_off0000e9b3.bin
7a149645a1ae59e1771468f5a542cd3e50a1e67aa0c50253e584e733ded70899
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 10316 bytes
font_01_sfnt_off00010122.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 16792 bytes
font_02_sfnt_off00011934.bin
696b97fc584814252835fe54778440ce91e86bbc63bc1e26f95d04e1e4d5b7b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 17212 bytes