Malicious PDF — malware analysis report

Static analysis result for SHA-256 30036c3027554bc9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-04 22:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59adbe651ee7dc90840f961d5bb1612d SHA-1: 2e268766ad11580206914128e73c1956c0ca42be SHA-256: 30036c3027554bc9ab2d3cf227ad3f9a7742e75ca24200e14a6e5a94d32a04de
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV, and static analysis reveals it functions as a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised or disposable hosting sites, suggesting an attempt to direct users to malicious content. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 5

  • 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
  • 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://seerupit.dk/assens/file/dazeriwo.pdf In PDF document text
    • https://samoinstitute.mn/uploads/assets/file/kolilubijonunoru.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/48700359188.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/mujiz.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/jevanosezagebozugozewuv.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/43824898771.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/62919772832.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/57792962934.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/saxokanerosifeweferi.pdfIn PDF document text
    • http://allycatering.com/userfiles/wobirarekejiz.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/34977480222.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/polirazorufinapat.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc86403196---rujozaxomanoluro.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/detafewuwi.pdfIn PDF document text
    • http://school15-tyumen.ru/f/fufowawenoserubuno.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/48559722670.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/runazafapujafinufebemudep.pdfIn PDF document text
    • https://ebooksweb.net/files/file/rujagevonab.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/90387189150.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/91766950083.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sjgvvpcpudj05gdonrd7q1k47n/remaxexuvaxatojiwi.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/55214396641.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/440229b7a4940d47c9bfb6c2cea6e559/12883691350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=texecom+veritas+alarm+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 10620 bytes
SHA-256: 6d4d40f623bcce24f424137bf4451449154ad6a09dd97c0442fd449d70fa8292
font_01_sfnt_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 16616 bytes
SHA-256: 8296af4f4ad90e149492d25cd4bdcfb7726ffbc776ead3a0468df8e49f99ed68

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