Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cbef5091c8fb92…

MALICIOUS

PDF

83.8 KB Created: 2021-08-25 09:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c9a4922b8a35e09ac161b8d4ec960a5 SHA-1: 6a3a60c72ef60f874e9f25a75bc53c6446f22fbf SHA-256: 37cbef5091c8fb92facdf14afe52675c9c0fdf3e2e4a1a6faba9fe057e892cc0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or redirection scheme. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crewmak.ru/uplcv?utm_term=1.5+qt+is+how+many+ounces PDF link annotation
    • http://vodnik48.ru/content/file/30717516972.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/40736fede4f42004d8e666be4b1a9884/bexebipisu.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/bodadej.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/eokqmuogb2r12sl16phel8i5u7/32799786156.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/81542464403.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6017cb7eeb---37091671309.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/terefilozowaxive.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcb1e178a9---vijofow.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c13b65c31e---75217077536.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a1e98a0228a5420b992e793d88c1922a/ganumogapa.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/92280697394.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/49576472040.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/ruputoxomupa.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/ladekinolitevafip.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/lonq23ru3j4m7cf2iu5ojmr0qr/2298093891.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/mimofux.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/deaba3m60kbgbuonqh8s0a4lil/19458050357.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/43001334204.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/pudojesevonorina.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/luwilasudotajesemejote.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/xijokezutobufoze.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/wuvuneboguximovazik.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/14bb5c6e5a69fa62239384f618f9ffcd/53313002481.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/67096043429.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cde495e9c---34380931171.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_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 17280 bytes
SHA-256: a1c315a5660f5057b06b0a36d06d25960013c9ca36f99e9bf6e2d86bf714b989
font_01_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 10948 bytes
SHA-256: 98ec45589c506c20ed995d8f64d1b4b30e0ea6b97137b72e8e6c060df79a009d
font_02_sfnt_off0001286c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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