Malicious PDF — malware analysis report

Static analysis result for SHA-256 22373733185ee1a5…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 10:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3855c682b27262c2ff057f84ec4036d SHA-1: 077fbe2a74569ca0cb6ca983abccda0f51256293 SHA-256: 22373733185ee1a5dd76228d86edc581b50a76afc34d2e1de60800a6fb1953a3
162 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of JavaScript and numerous links, many pointing to compromised CMS uploads, suggests the document is designed to redirect users to malicious sites or download further payloads. The link farm heuristic further supports the idea that this document is part of a larger phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8875

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.
  • 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
  • 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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/pnn9o446j9dh0atmncc9hsg4k0/65001402549.pdf In PDF document text
    • https://et-auditing.com/userfiles/files/49282069923.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/lasijajowuvojekuzupa.pdfIn PDF document text
    • https://advik.net/userfiles/file/67574303839.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/zakuvuralose.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/t1r4h06i4860f8m4ntalns1om2/60143180069.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/jekosekijarab.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3d6b7e98---16984478964.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/19974316647.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160738cda4e6df---wapov.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/jomupilomalolizum.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/wawoz.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/biroguzozigupad.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/96980493551.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/26921874515.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/3345816043.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/82e12768db5d3c8efaa198edda20214d/negenemekelide.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/kirutapebufu.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/vupititojexixulu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dcad1438d---1175482825.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607713f7a59a9---lipuxiragazav.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/96799390361.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ffa158be---somobapupip.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/74eed055abd6fd170755aa17dbfc2a5f/39422348875.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/83n4depehkjfan20o082lj5mdk/pakesepabon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=one+punch+man+badPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 17408 bytes
SHA-256: e09bb20a6ea68c5c63f71e3a3a89775223bb7c1bbe7993e11996d80325b17728