Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1293727b0b35a4c…

MALICIOUS

PDF

87.9 KB Created: 2021-07-15 21:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7be6aef0727d717ff488185088b53a67 SHA-1: 02cf51ad67c40ff2147649b52cb8c2a4bb12af79 SHA-256: a1293727b0b35a4c514a712429a117c13364f8dec6d3e0398836b389a81dda2e
156 Risk Score

Malware Insights

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

The PDF document contains a link farm that directs users to various external websites, many of which are hosted on compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7685c9571823b2eb274d5bc1fd48b2b4/noritegovumaw.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc467cab5a9---mubiveralu.pdf
    • http://agendatourvietnam.com/hinhanh/file/23630297728.pdf
    • https://aawyx.com/sites/default/imageuser/file/96580620983.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/75v89vg9lt74pa7oqk2li2vc61/39499578034.pdf
    • http://kryotherapie.net/neu/userfiles/file/11853982069.pdf
    • http://cupta.org/userfiles/files/20210602100346.pdf
    • https://advantagelic.com/singhania/downloads/file/moxurasodixumuduludi.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/0e206b22b5382d4e7a5fdbf7ba6458c2/18228136646.pdf
    • http://penzionriverside.cz/files/file/49108581805.pdf
    • http://bora.su/ckfinder/userfiles/files/lodigeta.pdf
    • http://onlineticketreview.com/images/file/minafevazagu.pdf
    • https://seeandhearbetter.ie/img/shop//contents/69888414871.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/93629305142.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/mqs3qngit521stk1rk8rg4pshm/penexalawobedigobenunomug.pdf
    • http://mmbc.cz/_data/user_files/file/51714314264.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/72093012757.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/201ae99a9d8922a7717a47bd71487367/90757458292.pdf
    • http://provia-events.de/pics/fotos/1/file/mifofefe.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/41c32ebcf71e441893691b00d8362c1b/rowokopeterifategedipiwa.pdf
    • https://stcc-sa.com/motakamel/Ups/files/14625611722.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609435668510b---jokerapikadutugudemavug.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160729b5323659---68458556566.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=1.56+hectares+to+acres
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5eb.bin
b8e493764f83236cf044b4cfc8ad33fda806de114be03ed745b444d220ef8e0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 10408 bytes
font_01_sfnt_off00010dbd.bin
90260e4e0cdb36988668f18ac617eae2492f0cf620ab8299f88516f27648db97
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 17088 bytes
font_02_sfnt_off00013a80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A80 16792 bytes