Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b97037a71112c09…

MALICIOUS

PDF

105.4 KB Created: 2021-08-13 00:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66aa8a1389c109e02296160dab0e9043 SHA-1: bd4a19e248728057e6b9a9599589a3d0073e5bf0 SHA-256: 2b97037a71112c09bbf5e1df7e2d5d78798598ac87c18331368d1865a2f28d4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://thicongdiennuocmiennam.com/uploads/files/bukurazukiruvoso.pdf In PDF document text
    • http://slhs1958.com/clients/18590/File/zorupupup.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9ba483037ccebf701105a41be8139ac1/74730935656.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a21d3431d---mezelojezewumoxunuruz.pdfIn PDF document text
    • http://chenruichem.com/upload/files/6228962379.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f328001ce3---4480435505.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/60159320480.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/rexagajigubat.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/162b4eb59ce8963fd29f08d2e99d5eeb/vuwozinuko.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/26431726054.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/dokavun.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/gijarewapotupozorukofedo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e121ce4d---sizazelatageboburesa.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/ragobevuximizeja.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3c49d1e08ad4e8018d9f89610496052b/14185161500.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/19575365454.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a811488ea22---35808946342.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/galifebavuronuwamojumi.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/56428885590.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/a9a581297a26b7f699e68787b8b06e8b/36248905811.pdfIn PDF document text
    • https://panama4d.com/contents//files/28982029550.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c67dd4d64cc63659e069b36a8fd60fcc/85468418820.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/4n39ckhvrqurdjuhan9ataaahl/7152794766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=divinity+original+sin+2+unlock+inventory+multiplayerPDF 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_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 11208 bytes
SHA-256: be3079675b705b152d1ec25c1765e11d874d095c43f869cf14ae13c74c54e220
font_01_sfnt_off000151f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F0 17668 bytes
SHA-256: d7c503b69b91718d0f46093729f6bd6a93496ad2758ffaa6da47da2051ac6476
font_02_sfnt_off00017fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1