Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65e62639fb299d3…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 03:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fcd101bda09cd105934171e6fa6ff842 SHA-1: 4e11b2660add050c73e4f09ded08980284694264 SHA-256: c65e62639fb299d30de0d68dad28b05dc800877044af2e7f9f49d7188192bdeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the URLs and the detection indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba0e24e41---92018755599.pdf In PDF document text
    • http://4bx.pl/public/file/fituwupebelepipupagu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ka2fgsrnvkmhqqki619gihmn6v/xodizipetamubedijawetir.pdfIn PDF document text
    • http://www.polni.si/Images/files/32189348374.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/39924779794.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/12560365165.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/kifen.pdfIn PDF document text
    • http://foxadv.net/file/25946822332.pdfIn PDF document text
    • https://grandegroup.net/files/19034314206.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/befibetobosirotomere.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/75650519236.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/1610020843.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/mikanikedalag.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161464140c8581---kemulutubamogumu.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/vudifapitolala.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/31039014372.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/2798346360.pdfIn PDF document text
    • http://venkateshservices.com/uploads/62695377274.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/xagaliradizovixat.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/6344219010.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091011102_367080043.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/refamejemowezef.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/11113559227.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/ludidefisero.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/kewidiludunarodogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=worm+snake+mod+apkPDF link annotation
    • 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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 10400 bytes
SHA-256: b3622d712300f03b61740387739da1b0c9564e9727bb90eba0d64997fd4e1668
font_01_sfnt_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 15524 bytes
SHA-256: 3d89c8c68e7f89879b66f8abaac2534a6335b60f2a8238a8a0856def6eea360b
font_02_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1