Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c49b8fa515af70…

MALICIOUS

PDF

82.1 KB Created: 2021-08-21 04:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 919c1f1cc7ded338b33f906e532c721c SHA-1: b107094b6274146e298b9af09ac4c608d6008479 SHA-256: 22c49b8fa515af7013de5a6b294810fbf8228707a134f4fc27d7026e7f8e6c48
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.valathors.com/ckfinder/userfiles/files/pojafokutatatorel.pdf In PDF document text
    • http://brenno-tojestto.pl/userfiles/file/72232823470.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5e27eca4---23500995972.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ed9e827661723265c6cd997af3f21193/4065765131.pdfIn PDF document text
    • https://ghnservizi.com/file/2080790775.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/18621953111.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c67e4dbc2---vuxububipom.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/9cf8c6f9849bb0e91f48d7b2ef52340f/601408193.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/ferovupiru.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e0df03103b33ef29adc2348dda63a09/jajuvesozujom.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a425ba830---47982721897.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5969e9ce74154dfb00991ae1b9a0670e/peles.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/35999142347.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8d72cf6f510e0627c382101fe9e4a42e/31154250171.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/danonugebewewipajiganisut.pdfIn PDF document text
    • http://arslanemlak.come/file/5532418062.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/58752980482.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s3rlimkmpiqmjqabfc70pjb7mv/79351435857.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/muwuredakevexomiwixe.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/puzujadebaduverizitov.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/nirilidazogalazirigafatab.pdfIn PDF document text
    • https://renault-service.com/userfiles/29035835716.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/d55483b5c67b706e1cec8d29ea04a86c/99873295400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=can+i+get+a+universal+remote+for+my+vizio+tvPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 10928 bytes
SHA-256: 89953e10307a0ea4a34663ea010dbf6428e83fc3bebdc93f582699fed25e9723
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 16672 bytes
SHA-256: 2eac3595eb48b9d88976db1d05eec79d02d82cb6160e715f2f8d398a474e66d4
font_02_sfnt_off0001224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1