Malicious PDF — malware analysis report

Static analysis result for SHA-256 2423ffacceb724b8…

MALICIOUS

PDF

71.9 KB Created: 2021-09-09 10:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b065a74873669e4895dc8e5d5a26855f SHA-1: 90a3adc4490673abbc6e2690d25bec5ef3474622 SHA-256: 2423ffacceb724b8c8269638482fa72971a403e266eb903d7fdbe79842b3d55e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, some of which are hosted on compromised CMS uploads or appear to be part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://aksaaydinlatma.com/img/editor/image/file/venaxozonanimajadawuv.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5051ada2c---18825134415.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/sovirixapolaz.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/94739561959.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/fomegabediguwuluvud.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/rubefewazum.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136260d1559c---82786854087.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/dojakobuzipuwuxeluwijufa.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/lasiwarofolotexilagenuv.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/bixukiwikevanadimakasu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/a2c09bcf906e553b7b006c2b156e4959/xadirolegitigujowizivasus.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/97049608178.pdfIn PDF document text
    • http://profstil.az/userfiles/file/16452980307.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161352350299ab---58978760927.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/sulimixixurutigizi.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/puximi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161365f25cf5cc---71841649088.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/bosimamarizagidomol.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/sojonevupalolowawavarero.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/24073827253.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/2101571517.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/57102879475.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/pirizagevizofenodonujava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+print+only+odd+pages+in+pdfPDF 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_off0000b865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB865 10864 bytes
SHA-256: 2e3b72daeeede5689eee384cee2265c3dfc6950a94db942edfaf191a0f93a11d
font_01_sfnt_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 15768 bytes
SHA-256: 142e68beca45190b40fa31219079967d32f63cae2bf309bdd44ba872c0e374fe
font_02_sfnt_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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