Malicious PDF — malware analysis report

Static analysis result for SHA-256 37194ac60fb22b31…

MALICIOUS

PDF

91.9 KB Created: 2021-08-31 13:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f63c9c1e29923e8c53888554ff4f600 SHA-1: 62a7da09a58e4dccc8f74a90647f741fddd34588 SHA-256: 37194ac60fb22b313a728747c09124cc39b15f94a98ec4ec520412116f5e1d9c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a clear intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=fasting+for+prayers+to+be+answered PDF link annotation
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/590f6333cfb8aebf636f4857b100d163/18726397680.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624238552.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/katevixojitiniju.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f161547b8bb---pisez.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d540faaa---jabatovun.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16300959897025.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e68d3f04---xesetekawoxole.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/sujetolifazuli.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/tinumojoluxulajuna.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/30110075705.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/49981088707.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c563b7d6a575d9e2581275192c84da2c/zalowekibafaliv.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607891ae82248---24782944646.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/8458162394.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612613f9262c8---59433180879.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/89167736867.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/bowetelabefedutexonoferi.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/75188178259.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5485b767a1f8c24bb90019d9787b3e42/15990320694.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e06e3eb9df---46413756917.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/50401555038.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/40400820134.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/12632655153.pdfIn PDF document text
    • http://altinay-law.com/images/file/lebidutu.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/89338794275.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9af9a2d987---60242836790.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/710e0c2eafd7460d704e3e04b3bd3853/13431005597.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_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 18508 bytes
SHA-256: 6bbeb4558b0c9ca04dd24f3a56906f5dd8f2cab2f52dc5e72bf2ce1afd2b2200
font_01_sfnt_off00013007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 10944 bytes
SHA-256: ce51e0426ef832885524acfc3369f0ef1aa595a0a514b413a2e780d2388d2cbe
font_02_sfnt_off0001492e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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