Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf256d62a0c011fa…

MALICIOUS

PDF

81.7 KB Created: 2021-06-25 22:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2da4332d3b8ba2849aa9cf41c84fec10 SHA-1: a8070a618d777a92e0e60ac3dfe027d702a08221 SHA-256: cf256d62a0c011fa610d51a01b13b94676bac961fe0f3c0a9086181c48ed6b30
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=carbylamine+test+for+amines
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c49e18c83a---vosaf.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f086f5b4541ddf88feb2de4dd2732b8/laluwitazawipofifadudiguw.pdf
    • http://all-pass.com/folder/editor/file/98327562985.pdf
    • https://abofahed.com/userfiles/file/motekafamovugenirazesus.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/daaed6ad2460a9bd9de35577a9e97422/25752678982.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e5688527---18689213043.pdf
    • https://viboot.com/ckfinder/userfiles/files/46166414154.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210605113801.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0c24349dc---89765231694.pdf
    • https://bistakalikotenetwork.com/userfiles/file/gujov.pdf
    • https://t2sc.me/userfiles/94347415902.pdf
    • https://agatanorek.com/files/file/38091038131.pdf
    • http://614move.com/clients/4890/File/96874094154.pdf
    • http://pileshoppen.dk/userfiles/file/sosawepiselovujapirigo.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d2ecafc2---zevudagopi.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5d9f1a7643a6cd3ef55d31db4ed509bc/fenimikinarewamepote.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/72c8065a232b53b26a2761981ce59da4/57454029725.pdf
    • http://wsp.pl/userfiles/file/juvopunajejejeloxe.pdf
    • http://sneedfamilyct.com/clients/44919/File/gozoziwatozujanepevala.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b589687a90e17e5ae05ed69dd6226a58/ruvopokunolame.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2698b19c6---duxigiritokajiboda.pdf
    • http://straub-online.ch/userfiles/files/83966828739.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/81ce43b57eabf6ecde295cffd48dc691/fasinuwokikuviviratarigi.pdf
    • http://chromatographvials.com/d/files/fedidezupanibubizotujig.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/095dcb81303e575e2997bdde4d764838/najafagixopirenumikamibo.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5c2bef8f066cd0180f8e7c29babccbe3/94916856838.pdf
    • 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_off0000db28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 16792 bytes
font_01_sfnt_off0000f33a.bin
a47a2613b166c190f321455a89f9514a168cbaf2218a202008f45b372c8f5718
pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 17644 bytes
font_02_sfnt_off00012125.bin
3731689d8e6d20af914be775bcddfa65e1bb285c03bc338a2a25f8d0e86416ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 10660 bytes