Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b01e6311a8f0be…

MALICIOUS

PDF

99.3 KB Created: 2021-07-03 05:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 916c51f155f0ffacd64824f919d14cef SHA-1: 8e1be3f186400d18cc13d7afdf8c545428a9d9dd SHA-256: 75b01e6311a8f0bec4ae0819fb2a6779c27011929766f0b7bf30770952d7459a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://archism.ru/uplcv?utm_term=right+angle+geometry PDF link annotation
    • http://penzionklara.cz/userfiles/file/40311353619.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0a7mp2mbrl8spsi6pk47p5nc1b/8017025289.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160746ce0734e4---2709132192.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/juxowikogonabexuvor.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d658f750cea---rigez.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4ce495715dbde48eb774888824993b51/jufabevuvamutesajuwajo.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdaadb8efd---40104264551.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/60234847068.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/11056928488.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b60cc299a---tuvojekovuxojobuvunejiju.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/womep.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/92990558974.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/64652a498d31a503ccb17d0eaddc30d5/sopuzas.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b6fd767ef---patosoxutafivopaz.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/bejexuseku.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8883ee279f---96887223430.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/57073870578.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e864cdb37a22e5cffe16d00ea192f0e6/41517448615.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a254571ae6---72089484625.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160982d63ea7bc---vunekunuzupuv.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/73840552270.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27fcc86e29---talonolatowakikidax.pdfIn PDF document text
    • http://ipceurope.com/assets/file/95245746069.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 19044 bytes
SHA-256: 9a18893dad26c7c032b1921275c3b09bca0b848d49b442383b4e3ff551113254
font_01_sfnt_off00013a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15268 10544 bytes
SHA-256: 20af741b2c0c3fb5e9ef62ba68ebb6fa2c7b11fb9140a297126e96aed2283ca3
font_03_sfnt_off00016a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A37 16160 bytes
SHA-256: e47d54959fa1c2265039860d6a96c87349b0626bf9a38c8d84f42aa2005f01f3

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