Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d8b6b424e9893c…

MALICIOUS

PDF

87.2 KB Created: 2021-09-08 04:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69569486e718d08d359c801bc65c087c SHA-1: bb98756edde768c5a11916829a4e2fa3aeb754a4 SHA-256: 99d8b6b424e9893cb0c80dc0e6c760585158d84f86a379fec7e918296b407cdc
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm on disposable hosting indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4658

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=convulsi%C3%B3n+febril+pediatria+pdf PDF link annotation
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/7489ddf21689819da8d2c1a1ffd2bde0/sevufis.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/2545711326.pdfIn PDF document text
    • http://vititanon.com/user_img/files/30179124547.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a40eec9e76---47020825073.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/48661566906.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/regigemorigidobotamimage.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e167b65dc---8021915675.pdfPDF link annotation
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/rovojadamulijo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gezelajatikap.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abd630192e9---baloxuzosufibubefuxebiwib.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/17041381200.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d00a2b07---10214740136.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/7f2ca017cdd29ea4611cad222e8d9866/18592254816.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210816_7010DCD8D28B0254.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bda5e980d---67880906510.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/55446965201.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/79450357686.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d36233ae44b35dc48fbd18cd542c3d80/74862556346.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/luvovotujuxafoni.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/84206443445.pdfIn PDF document text
    • http://ropesadventure.com/d/files/10796326718.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607622a3d3b74---69550583639.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/fodasolaraza.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/falewubemirebedokunadati.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/28429915455.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/bivapen.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e43c25507a8---8327285747.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_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 10964 bytes
SHA-256: d097d0f08f62d362cdc8a4c1e52dc29f79f17c0c6288451eb6269d6541fdd8a5