Malicious PDF — malware analysis report

Static analysis result for SHA-256 26979c4d13e855ed…

MALICIOUS

PDF

92.7 KB Created: 2021-07-03 07:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6ed415d7e85112be85bbf0ac61ecf803 SHA-1: d5bbfb5347047126022253c06a2ddcbe0e4cd694 SHA-256: 26979c4d13e855ed24cca86b960377683b5454aa8759b34debe60592b53bed5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cd21c999987---38350806240.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8b06d7eb---93964732818.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/84682395944.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/pisugapijana.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5d7f29b3---nosavimepo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c13daca22---45740377628.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/73epvs81fusmc2g2dq03m9iskf/lujexu.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/virafobexedizisofelunax.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7nktr4d5nm14daj90v2c3i7240/15575593324.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/171fp6qanvgq73rfpr4tjks3hg/97787920219.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3db48dff0---83654039927.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/aaeu4r0321c2lssh493qmq6u9i/rabewirinibipumovobo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b44b0aa05d3---rikusuxawabi.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/7455745759.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a126be8b80e250cd67d69d73ecb12eb1/42886528513.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160754e42a94b4---kevogifumesodibo.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xiraxisatinexamer.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d656abd5d---zugosati.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e966d7b5---6298640874.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/63766321981.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da54af1ff0---87035192986.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2b7449bab681eb96ea2f1dde7ba0c35e/67396207413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=simple+snacks+for+eveningPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 10960 bytes
SHA-256: ec286b9a9edb6195fedff8abac3ab4403a525342ffbc0f65e390e4ad1170aba2
font_01_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13647 17720 bytes
SHA-256: 19cda5d5312cb0ac2a582bfd07f1fc50b977782c1e7ca1b3bb8d2494cf19a07d

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