Malicious PDF — malware analysis report

Static analysis result for SHA-256 2307f34044193383…

MALICIOUS

PDF

105.6 KB Created: 2021-07-24 10:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9cb247ce7c4a0b9272d3dd9477dcd735 SHA-1: 46788cfdbb2f416d1cbd23793f0489b92393c3d3 SHA-256: 2307f340441933837008382415ef35cfe51a4c827dce2d3c58ec729b1bac7f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of multiple unknown URLs hosted on potentially compromised sites reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d11ba30b4---90945345195.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/u0taqdalhh5bv17geto2qpi5k1/jutevepovezinefawalugopi.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/wizobabigoxerumonuf.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/57t1mien8eeg55olt5ra8lfnbc/borumiwugozusatazatalapil.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6m6akdvt35gddtn3g1es138hu5/36367124763.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e02da078d31---gazukoforigonaji.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/32672330436.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/80371390265.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4d9a3842---16060142227.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fbd1bc01a---xuxapumakutodalok.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/jejino.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/06ac745a86348085d711acd50addd412/zasuwefival.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/49672189357.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080d511adc6f---jipopenisugabenorerom.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/53b60k66npk43h58b2m7bt4ql0/96603372007.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/tasade.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3580c1b50---pobin.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/pimimi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/savikusikixiredowujovefuk.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c75d3d17a---lamavitefapati.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/95045168500.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/lurokaxinimosogavegovuw.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7g782a801p93l9pcdakghm6ll2/1210539263.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/bo0h45sfvnlpfv258jmvs40ikg/birariredaxi.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/fesovanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+backup+an+apple+watchPDF 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_off00013856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13856 10520 bytes
SHA-256: d27f1b0fb8a4adfcb8d0035765d3ecf26817fd7839b386c73444183e7262ba77
font_01_sfnt_off00015010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15010 18528 bytes
SHA-256: 3daf83dbe2c05e642527650dfa92fd68f44fec8dacc881d609459c49e61c323d
font_02_sfnt_off000180ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1