Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde72e659ada193f…

MALICIOUS

PDF

114.0 KB Created: 2021-07-04 13:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: da4f2c8c08baa285ada09faf2b1908c3 SHA-1: 5567b45b9e7339a63395b4d7acd980d53c9e6f10 SHA-256: cde72e659ada193ffbb450459d54e1fb31732c888e3c29e80cddf2a4bd997667
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests a coordinated effort to host malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://laborke.ru/uplcv?utm_term=properly+punctuated+interjection PDF link annotation
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a7e8fc25---xomigeluta.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fe2db087bad59b6480a9dbaf8190b6ae/50236912671.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/rikisinamupekivivezi.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jejobimanedumuvosoxav.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/55068479440.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/6472072323.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/xirewubokofunepeguno.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/58187598236.pdfIn PDF document text
    • http://gptools.net/userfiles/file/88034041989.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ed59d075c0e47c4ec24937a08c1f25ec/loduwejesakagimisufuto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b90c7315a---sarokozomezefivalija.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uri7e49a3hhrffd3b0koar7b85/guritoxitagezegulozofuli.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082abdf1401c---80122066900.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/76406726944.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b69943c67---xobazezafidupuridedup.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/4898793787.pdfIn PDF document text
    • http://surtek.biz/image/files/20150201_093200.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9882365f---42076635489.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/1902752984.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb480e1d89c---82906208223.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1334ce778e---xedipolid.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/sotalonomudo.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160be79aa8138b---7451566299.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982313118a0---pifugojabevemi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/31ac654a6b568fb5cc68b0f245cbd605/63429007283.pdfIn PDF document text
    • 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_off00015d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D26 10684 bytes
SHA-256: feac00537458119c825ab23ea557a350b2a335ce3d156c8f96476b75b3d8a2bf
font_01_sfnt_off000175aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175AA 17364 bytes
SHA-256: 4dbb16da4a6966aea64baf20cb0f076ada006915ed1db24290059a6890ae94f9
font_02_sfnt_off0001a2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1