Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6693cea16fe730f…

MALICIOUS

PDF

59.5 KB Created: 2021-09-15 18:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 615a977fa5cf0b3c41b275f8f4fc7b29 SHA-1: b50b5dedb0bcf5efce15146f44b5911276dba770 SHA-256: a6693cea16fe730f4d8e390fd628afa1903e889f1547ba2bd837ce69edf3bb74
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9538

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=starting+a+sentence+with+during PDF link annotation
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/tozitanezifet.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4e5330e16fdd1b82fe335cf1759f4d0/1423944743.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/62272263670.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/59419020185.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/51108148683.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/36559141601.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/timejaxemozu.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/38894519558.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4e7af96c5fcc4183debb7752c63c2c5b/67377670410.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/xomozovibowi.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/39600884871.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/58923584721.pdfIn PDF document text
    • http://debten.net/UserFiles/File/goroja.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/92388266125.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3v5me42kn25jvh3tlmt95hfmi0/burominumupoj.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/69011759424.pdfIn PDF document text
    • http://herve-coiffure.ci/files/90136064243.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/gununowebosokapilakaj.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/bizogijarup.pdfIn PDF document text
    • https://etadelloro.it/images/file/povunejomaripif.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/vidonekulumikonedu.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_off0000cd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7F 10744 bytes
SHA-256: 65aac200b2bf12938a0441f7751e0b391c30ff2dc1a9e9f074df21009024f4c9

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