Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83ac528d2f4ff88…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 06:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bbef7ebd64ff183aa955e30a034782c SHA-1: c84411de24f4df0344037ab8e6745b09676630bd SHA-256: b83ac528d2f4ff8825f4712017d5c516e48ef9a058c105035ff2b99f583b5539
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://olsztyntransportmedyczny.pl/userfiles/file/jugoreronisutexafapo.pdf
    • http://gzperson.com/uploadfile/files/gosabuminuboxafe.pdf
    • http://archifolder.com/userfiles/files/87890112672.pdf
    • http://nfraccon.org/userfiles/file/26299937560.pdf
    • http://studioriboldi.eu/userfiles/files/13243203456.pdf
    • https://strategie-forex.com/ckfinder/userfiles/files/65609528346.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/19f48572acad502df00879d00b35019f/tewuzirigitogatanovu.pdf
    • http://beiwendq.com/data/attachment/file/23991726338.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a2d606a21283e6238fa7f9d83edfa41b/97192280298.pdf
    • http://autoscuolauniversale.it/userfiles/files/27043679899.pdf
    • http://acsalma.hu/userfiles/files/90287555638.pdf
    • http://acevina.com/webroot/img/files/75823724461.pdf
    • http://sibstroiexp.ru/userfiles/file/44467694614.pdf
    • http://timnhanhonline.net/upload/files/sozokologoduf.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/22669193532.pdf
    • https://okazionche.com/files/36854752080.pdf
    • http://mlight.cz/archiv/file/54095613861.pdf
    • http://kingsap.com/file_media/file_image/file/fekoxodexenuvilogi.pdf
    • http://salamino.pl/userfiles/file/29602332663.pdf
    • http://giovanninociti.com/userfiles/files/93478077849.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d03aa71a9---lofevub.pdf
    • http://xn--nellieskche-0hb.de/userfiles/file/30790170871.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/digiwelududifola.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gyro+buster+hd
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c97f.bin
1b008cc35b0347641e075dd39c7cfaf0b8507fddf0ae3ce712626dd17ccc6b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 10332 bytes
font_01_sfnt_off0000e104.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 16792 bytes
font_02_sfnt_off0000f916.bin
f98efddbc8ed01e53de7fb97cc97d354a966591ca219a7213ad1e4f5a103e3c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 17044 bytes

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