Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f761ee111462c5…

MALICIOUS

PDF

92.5 KB Created: 2021-06-26 09:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1828e44226519a042417a7fd121caf9 SHA-1: 1a59b9f0befd72933e347ad00bfe007a8015f397 SHA-256: 25f761ee111462c518d00eb54ce8c987e06a49a5f8b0452baf526cae4b982f34
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure victims to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c868a5523c5---26051442955.pdf
    • https://aquafilling.com/userfiles/file/78001727074.pdf
    • http://abwcoliseum.com/uploads/files/3308372814.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917dfc826bd---14490610061.pdf
    • http://blueyee.com/upload/file/181047249385.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/599a2577db98653980e566b4a770fa8d/8995029944.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094265398596---dikerizunoxuzesaxoxas.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/hhk01sck7s2a7bdjr6om2u5hng/37421648209.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ee286618---42159601847.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2e01a404ddb95aa9f1e7da756c8ebaed/19002129651.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dj5l6arvq2v0mfah26kuhrd9e0/98826916017.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33bef0c47---27971455865.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/6ng8m0238lvftiboss5vag8094/sugikedulowigaveferupeg.pdf
    • http://nuestratierrapremios.com/campannas/file/43731917660.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607945ef58ece---sewifepegibul.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075183078435---88181095735.pdf
    • http://omgmediatank.com/userfiles/files/44616142945.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a1c3c3ec6060e08546aa8046b4229ccf/xitudotalabega.pdf
    • http://goldmustang.com/files/files/13860744230.pdf
    • http://czdashan.cn/uploadfile/file/2021051600585873499.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ce800eaa9102d4c59df81f10629ff7f8/16348495131.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607475699dfdd---44306504934.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae314deb3a---memamonazeboloxasagijez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+cusp+of+exposure
    • 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_off00010976.bin
09dd16235b03f27915e980c3b05ed9b9d8e0d75b4f1bd9375e52e52486d7293d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 10240 bytes
font_01_sfnt_off0001209f.bin
5c7ae466554ea31a8b2a5dfb46d14082f60381042432721dd0fa1f18a751b51c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 17132 bytes
font_02_sfnt_off00014cda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDA 16792 bytes