Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aee04420393b395…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 11:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52a84e783146b4aee83abae49e1bec13 SHA-1: e78d1f06070b45768c3ff502c23d6a3a9503a585 SHA-256: 6aee04420393b39589cbbce599d6f49a6fe60cbbd0fd3405a1688a8b9dcb1bd5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the extensive URL list is sufficient evidence of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://pistant.ru/uplcv?utm_term=mark+knopfler+phil+collins+sting+eric+clapton PDF link annotation
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/vunvhfdajpvs4uuj0vbt687ro0/ximex.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/aa6b1a1d54cbc70f73340d26b3e7d2b3/dazasu.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/10181044190.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/mibovawisutenosebof.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/gavozebivawa.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3660a1675f2907ceafdfd599a9a61506/gavodekapusag.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/33962947949.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948792ec189---56751359372.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/sixonadutijofufok.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/kafitaranorizevofubipore.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/89677084857.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/gijifuk.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/rupagolezanurifomir.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-18/20210618045532718463.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/r13scmh9ucqujuf6epvuioqni1/6261524216.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/20301202457.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/kogiguxaloda.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/85179530142.pdfIn PDF document text
    • http://hotechike.com/files/files/vokizumerawew.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/kutovukutaxeripavujaxejo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095ef987341a---desapu.pdfIn PDF document text
    • 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_off0000c448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 17776 bytes
SHA-256: 68570beb0b748ab3199479491243d2f0bf02c8f2f550e88bdd9420d2a97195e5
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 10844 bytes
SHA-256: 31554ba5d76031a2a63678e7dd12c8e5378ca1e203f8fcc73ae9d9a68f24c53c
font_02_sfnt_off00010b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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