Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8b2a3500d411e1…

MALICIOUS

PDF

79.0 KB Created: 2021-07-15 10:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba13e2dcd13e12f40f8db436046ca306 SHA-1: b2ebccfdf79aa9f27ddb3fff7624d8ef2485e9c6 SHA-256: 8d8b2a3500d411e19251baa0a2ae003a0699bee3438ef4664e30927c071ffd67
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF link farm heuristics points to a deliberate attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5252

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=ab+initio+meaning+in+law PDF link annotation
    • http://geologocarmignani.com/userfiles/files/2989659137.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/mitenabetujulebomaza.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7e2314d1edc5609fa63f40837ab1d235/piliz.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/22106301817.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c8c0b6a74415ea9b2cf8e9047f418994/41918254892.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8262764291.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53f0dcddca---55774993001.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/aet3jp2fqeca9lkjae9gavvrq0/naxudej.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160857ae08165b---nuwewodakelibobigonexuwo.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/49479382955.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e4fab7b3---52618665212.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845da5561a7---61031357439.pdfIn PDF document text
    • https://vestol.bg/files/file/60536113269.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c115026d0c8---15510940650.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f07f554---34064011143.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daaa3e1fadd---56893367082.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7906421f3d---15184068656.pdfIn PDF document text
    • https://arerp.kr/data/file///34272682370.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/82100407724.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/46586808642.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bed953cfe5b51413ece668964eab7f73/genunuxagajuxevopapewafem.pdfIn PDF document text
    • http://amdind.com/userfiles/file/pumuzataxexeralalakiru.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 18944 bytes
SHA-256: b347d09429faaeaf8ace212ace6f09bb738c67530e7ba868c534886102eca5ba
font_01_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 10392 bytes
SHA-256: bc47f0f189a939a45489140f7bc15dcee7513e433316b04209b5db8a1d5e9beb