Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf7ad635589efe6…

MALICIOUS

PDF

83.2 KB Created: 2021-08-01 14:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e954ab03f27297c4358d6a4fa3578fa SHA-1: 1ed635203a4c907d7858b894620f13defcb76374 SHA-256: ebf7ad635589efe6f88c33b88a144f94fc50b91fc4db5169afcc9618802c0b0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://webinaris.blog/ckfinder/userfiles/publics/files/34761504917.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08f414c88---gugonewusonuval.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/03df3932e46c32c510088c1003a8146f/60030814388.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210713072937_v4zm49.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/91172143296.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d71b880fb04---kigaradona.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vagiginafadebem.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161010fc7c4cea---xuxubolepaxa.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/4b92feb10c96b0b01671039748bf47da/lizagugalapogibezesuse.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/5642q429hom487kbmmuel1gfm8/nikidisemaxetugowabedi.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/352b9ba9b3d538bd772233a5bcd01324/tokokimenexomuxodimopa.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/volibularep.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ac8bfahv1244ag66iq6r6qu884/99430278578.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/mupatafiruwojibifirofewil.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/devatovejutewasasavalatug.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/22608141646.pdfIn PDF document text
    • http://gptools.net/userfiles/file/63787685882.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/54566704356.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a0b51c6a996876bf9982ac3e759930dc/vamugowuxorozekose.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/nezijupojoxowope.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/68f8218463f563a5dd84dbe40d553b74/88098645796.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d971a699aa6941c029eaaddfb2f376f9/92461841322.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee9b557ace---85565397010.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac894fd2e48---57406258181.pdfIn PDF document text
    • http://isvpro.com/custom/files/pumoranofaxevivil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=signos+y+sintomas+de+la+anemia+de+celulas+falciformesPDF 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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 11108 bytes
SHA-256: d9384a0922bc70213b1439671f07bca87210eab39bebff0de61064930905758c
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 16792 bytes
SHA-256: 634d52279941eb8418f22ae4b7fb075f36d3c311989377fecbfe29d823610f40