Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12450351ed5c2b1…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 19:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f1604f518d005a7dddd498ee4f950cf SHA-1: 7c28561138238defeb7a1e06bb0b1d6786a23519 SHA-256: b12450351ed5c2b18866e9fb727923a108523859e1a5adef9c037a0f44c7b962
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of external URIs and compromised CMS upload links suggests an attempt to lure users into downloading further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee72857269---demuvufijape.pdf In PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/db1d96887f601aa04c6dad446e0a3cd2/82235352190.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089949c0da70---wololed.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/detaj.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b966434f6---nogegirumedi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6r74eo9ns60pj7151hnre12su0/guluwutokeromuropu.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/qhes9ihua6ctdugv11fsp4h4jr/63972780002.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8af535996---japofobu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e8df49b66---50074514541.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/93267858688.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/xozinusidipoteg.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/tewom.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c952606f5f---lujuxatuko.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094826b9fa4c---53435434741.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/21003635665.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f54e068af7941cf741fdaac052458701/gulufisazerifuxa.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/87041317643.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/387599424529dbeb40b7e4cbf92d4b8d/98691735225.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/lokugosaxi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1d0a8bf5765e3c783ca69fb9d5384318/buwekodipofak.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/gegijatimugekalo.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/31730961849.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7013ece41faafdc17542682f05d536a8/54044619800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sony+zs+rs60bt+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC147 10824 bytes
SHA-256: bd86bf35c184dbb7bf0d65810c37d475a5a0136b9d96563d4d8f395840254de3
font_01_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 17508 bytes
SHA-256: bc4000c138f098ace5121fd2fc1a0869658a61236f1df528fd04e4d799b58a93