Malicious PDF — malware analysis report

Static analysis result for SHA-256 5138e1f42a528d46…

MALICIOUS

PDF

93.4 KB Created: 2021-06-26 00:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 2ab0382a7ce6a7239274eed3fc3a725e SHA-1: 6ac3d240adc808172f20ea12ce19a5bbda7abb8a SHA-256: 5138e1f42a528d461f0093be690b2a68351fbeb9ae8be39d46d41453c49589f3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://herningbadintra.dk/app/webroot/upload/files/73426352861.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qq1rfagtrlqchm26i4klovgrij/83669838893.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/67112375548.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2dvterr1kpdteuvmveo57ips6v/73240566411.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021053100302795.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210620181407_rih16m.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/wekuwiver.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/63077945073.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/45497913132.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a64bd59aae132b43429538ca17480e48/xulubivamosuwawagogamej.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea36ca9fa7---1981167648.pdfIn PDF document text
    • http://jump360.co/upload/files/20210610044613.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1993a6a8c---rigusujokukikaroxopudefi.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/7c61300dad99d053d4bbd35ef9d3bcb2/76919841801.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5a488d6d8f70abb753a31b3bddb2e27/30534687362.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/notalofizabogolopar.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/90453365884.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720499cbeb0---36798771739.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/b590cohku63klhuauban8ob091/54010411417.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/87abc66fe79990a167f658ce6986f2c0/8574345649.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73b62d8c7---gitegatotizewomiwawos.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/muwufudo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bade4bc6c5---dazomamirake.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0411bebb4b---37082495034.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/80546009700.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff469b1e4---98890884629.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/90318131107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=feasibility+study+for+concrete+block+makingPDF 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_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 17248 bytes
SHA-256: 5b0c5f5737a28b36ea0000b90e413f50471e704b4c1be24ceda8100f7b05cb5b
font_01_sfnt_off000133d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 11240 bytes
SHA-256: e15f3a8b7a3f5724437bb56e92dcc686e22650f8ebe1d57ec72d9a589e6883b1
font_02_sfnt_off00014e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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