Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a79bb49f02f9354…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 07:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18bac442279634751ae21e13a7fea799 SHA-1: 6cdec9b2588b38124cae65144ba47b5e411bcffd SHA-256: 0a79bb49f02f9354e818665d0084fa8b9c3122c41cc95fdb32888ecf62855aa7
156 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 numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://medvor.ru/uplcv?utm_term=my+uncle+is+what+to+my+son PDF link annotation
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbc1868c5fe00a15a0dcab5bfa49d9d1/kafomow.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/80134222166.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/45383200516.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16092428b81a56---mufusonenobilet.pdfIn PDF document text
    • http://iltorg.ru/upload/file/37623011166.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/sukapisedug.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2df417bda0---nepobezegir.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/41935424094.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/rutiwovirozumonapuv.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8ba6077a---85214206692.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/xirux.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/34654379916.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/818027ef05f5356c7e9627a36c7b4060/99330486008.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b110121356---45049621413.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/de26d2d577c3bfe03b4f840605bb97ef/76133813562.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5c3b79fd---50593158836.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb60d1d0ce---28384258388.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/seneravavegumuzoxagelami.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/konibepa.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501123418868375.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/g9pnurbneu8vhr7vblmebvt5g0/94074306185.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lafobexuwoperolofidipo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 18588 bytes
SHA-256: 61857dc572476747500413d34375a595a188228a85b62a885b973e7f57ca54a7
font_01_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10688 bytes
SHA-256: 3833cb17b4502e199334c7b32fa88e76ba9163afc32de997c1c48f122534e0fc
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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