Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5418543f6f5130c…

MALICIOUS

PDF

118.8 KB Created: 2021-09-07 07:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4862cb5695553c620f397f418abafe82 SHA-1: 69dc9b112294b84af2baaadda187858ef0449385 SHA-256: a5418543f6f5130c1d9c69ed58fb60fdf4a8e586077dcd9ceb3bfbec0ad14458
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to leverage SEO for broader reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://hzautomatisering.nl/userfiles/file/84969661811.pdf In PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f2aad6b2d578f603ce8914ceca06283b/kavoxitiwaroturo.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/revorozobimafugafero.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/navavotidexejo.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/5b6caa0ce454b112b60aeeaf94131d25/mizafafijoxudujoto.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16120c896cf6ad---63418158277.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63524987134.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/rawol.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b031fae5b981aea36da328f0bec6db1d/32380651919.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/9379913867.pdfIn PDF document text
    • http://lucann.com/Upload/file/pawefafalijuzadeneli.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b5d774dbe---puvigeb.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/rikufatazagabar.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43811120d---83474163726.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/kigibuximevuj.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/39908487082.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/30761743048.pdfIn PDF document text
    • https://majubesar.info/contents//files/49246238788.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/sobibitivivovudure.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/nrh2cj3612q0o1qfvsmc4t4l9g/61924193072.pdfIn PDF document text
    • http://fructusartis.com/i/File/36292240687.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071f8164e19c---wutasijizu.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/bufurojurojomaturakomo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/54da0dad0c6e57c4089d77225861f72b/saxomixusizefowisiruxan.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/248df7ae214acb314253f9e40aabee96/gupimuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=los+mandatos+informales+worksheetPDF 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_off000165fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FB 10756 bytes
SHA-256: 9f466660880fbecfd200bfc3f1f83f556d30d85397903a0893c8d0c048f5878f
font_01_sfnt_off00017e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000196a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196A3 20896 bytes
SHA-256: c174dec7e5b694c8a304363b643e316aa0dede78caa04402615926a7cfba5a69

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