Malicious PDF — malware analysis report

Static analysis result for SHA-256 286c970921011f1e…

MALICIOUS

PDF

84.2 KB Created: 2021-07-03 06:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0768935213f826f1e6cec98121aea56 SHA-1: 275d11f0deaf50c9ebbf5d9713feb647e012eb9b SHA-256: 286c970921011f1ed08f99e6d3d057b485df282ac161b3d9fcb1381fbfc0e028
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. This suggests the document is used to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9317ae00dc32343664e3c0aacd96b999/faxon.pdf
    • http://kasaitogo.com/uploads/files/sesimotevarero.pdf
    • https://zlatartopalovic.rs//files/22155615144.pdf
    • http://eltonltd.ru/sites/default/files/uploads/1221340407.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840a7b17720---34662486773.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087cbb635c94---rovebeg.pdf
    • http://lacasedescaraibes.fr/file/54092997405.pdf
    • http://gernano.eu/gfx/userfiles/files/42097938501.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf302f0d9a---34798228588.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/73014954720.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/64481f8d6fb9f4ab1f470ef266eeac01/jazuzitezebu.pdf
    • http://mbcasc.net/imgs/file/80900083081.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/836bf0f265887910ece5e4fe65103b90/fegomojoz.pdf
    • http://sam-global.info/files/file/45226298899.pdf
    • http://wadsoda.com/UserFiles/File/85104617631.pdf
    • http://cnex.cc/images/blog//file/mutewewimujob.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcab0a5141---tevutenimifadosifelis.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160929c01ed39a---kolub.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076c968b3b26---gotezafis.pdf
    • https://pharma-tools.eu/galeria/file/dabutudiwotisibazulaget.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5dd466f81---wawimubarizesakadoge.pdf
    • https://preprodpcb.com/userfiles/files/fikinomokom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=words+with+w+and+n
    • 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_off0000e845.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16792 bytes
font_01_sfnt_off0001005c.bin
ad6d017bc6b9a2833f1fc09f1f28bb0d1fd3f018f61a640a2f3cef2f9b2397fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 10244 bytes
font_02_sfnt_off00011758.bin
4abbb19461850c1366729125e1d3e31258febab1f434d31eda59331a63b7be01
pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 17080 bytes