Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed956371d2666e8…

MALICIOUS

PDF

133.7 KB Created: 2021-07-16 20:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4a6e11dccb7c3498da23643154cd55d SHA-1: ceace2fbc026cae2bdf9066164222a862f3b5505 SHA-256: 3ed956371d2666e85d742de3dddbcc96fa16df64f9d6844afb3c55733dc546d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://files.ibiza-ferien.de/file/dovuzosixobilaw.pdf In PDF document text
    • http://megat.pl/uploaded/fck_files/file/5607645241.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf91694c8e---96686848234.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9bbeb0b4---78649324694.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/josobulut.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/1189292662.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e3377e103f0d0dcf72a5639b9556b5eb/21415334245.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/61157755064.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/67121091064.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/21760049489.pdfIn PDF document text
    • http://myphamasia.net/upload/files/nerapixubibimafotiwidepa.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cef9a0424---xatuzedowupetapolipit.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/13729156596.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/239fef1b17d805c9f30782f0c757920e/89468603598.pdfIn PDF document text
    • http://deauville.ru/files/file/golafavuvuburan.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/fosudawari.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831525383e3---99005145594.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af628195843---57314265716.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/zofelajodenapiturofo.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/64b48e48df764da2ebc3b208a20b120d/62381165210.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbd4dd086---pezupodaxotamuketogo.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/9327597212.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/vegukabasulakikozosimijo.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/vunitodevonigoduv.pdfIn PDF document text
    • http://ssurll.com/10c01yIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hoi4+instant+training+commandPDF 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_off0001a85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A85B 10604 bytes
SHA-256: 20e0bf2f6de54f0c8e9ff5e7f4cf27d72ed383decdc081bac5d59d910ac50f9b
font_01_sfnt_off0001c067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D879 18528 bytes
SHA-256: ae1a37bdf9e18ce9f69e7628e71e34652b8adbfd45225cba376501d995b5b9a6