Malicious PDF — malware analysis report

Static analysis result for SHA-256 05712a173ed05566…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 15:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 893630dd3405c26a970dda08c750d468 SHA-1: d184181b912f4a7014fe3542271b31485bb687a3 SHA-256: 05712a173ed0556680265bfe1b11a8a9e770c0b3ce5e9f1cf877372cbbc44cf0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The heuristic firings indicate that these links are likely part of a link farm designed to redirect users to malicious content, potentially for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5561

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=train+the+trainer+pdf PDF link annotation
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuzoxupirezova.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161086e6377012---93827147032.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/26175127491.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b96e1c541c69ec302047cbd3fc66859a/91358267900.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/g5sfo4fg9hr3b63t330v4uv8c7/bitawanudogosu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/66cca20a06bd4e2a20c7af12d14e28e5/milofonaves.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/kubiliwexukadixojabazig.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/finewosopin.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/zugabupokobozisiwonawezar.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/siluwoxutigepiwizedusi.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/49450494776.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25699dafa9---94241060531.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/oj7j14j6s3kgdlv5ui69eb5c73/semorizofexiguzoxelide.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/32f503b129559fdc72e638e213cd1fad/luzimuzunekubagutuzozaxu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8081b52d6969dbfbd7e8f585fce9bbac/nivogumonulete.pdfIn PDF document text
    • http://x-leather.com/radsportfiles/file/6887258335.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c606834e5a---93217716874.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609013d54fc81---nalidonabonijabumufixeb.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/17137072346.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/32f67aad960eb91ce8922aa082d14e06/dewikawawojapowega.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/duvajijin.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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 18716 bytes
SHA-256: e46cfc3ed63ebb98c7875bbd51682e5ad239556152822227c4226da5bc0c20cf
font_01_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 10224 bytes
SHA-256: f280eed38bb611f786d3e1473d9f4a481dfa4bd157ed8e5382d24204b8c4a526