Malicious PDF — malware analysis report

Static analysis result for SHA-256 af61a9a36a76eaa9…

MALICIOUS

PDF

66.5 KB Created: 2021-09-10 09:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: adc3ca0e527a5e2994c5b1bf9b0e974e SHA-1: 3fdb8cd50951f0eec8d1f258bfdb75b3629110e0 SHA-256: af61a9a36a76eaa999ef7477aaebade3d6c77c404dc0878fd31614ea6e3ee11b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8294

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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://drafthe.ru/uplcv?utm_term=java+lang+runtime+exec+example PDF link annotation
    • https://motelandratecuci.ro/userfiles/file/vawefelobunimudevoga.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/konojubipumumorutoxemab.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/tasetamenitanokuduvija.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/78161124800.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/64840234344.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372a8ac283e---mizafipajupevororofum.pdfIn PDF document text
    • http://runhouchem.com/upload/files/joduwagodigujizexo.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/mejerovakobuwijudusake.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/73947701473.pdfIn PDF document text
    • http://superbarter.sk/media/file/samusevifiradu.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/geliwapawuvax.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/90794014539.pdfIn PDF document text
    • http://wohntraumgmbh.at/17325651937.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/rokobinelemep.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/jafefoxe.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/72771305191.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/f8ac6af13f2926793cc352b331137c03/27606811810.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613464b33c096---gaveralur.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/17113851996.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/kudomozulaxogakoravuvetuv.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136953e124d4---17567356575.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067e04e86b---71818661558.pdfIn PDF document text
    • https://kaparatt.com/images/File/84610041804.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/55066314329.pdfIn PDF document text
    • 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_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 10688 bytes
SHA-256: ef02ffc322f72ecae4f5ab761dae3eb8413a99484f4f743f101bbe8b6befa01e

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