Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc60594e31382721…

MALICIOUS

PDF

75.0 KB Created: 2021-08-12 20:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6da9ede83fcfab848bb6291adc7265b1 SHA-1: e6d86843e7a80414953e0674b69beac3c62f245c SHA-256: dc60594e31382721c8a966d9a160979dbb42de8813dc27475f22683aff0f02f6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=texas+aut%C3%A9ntico+2+textbook+pdf
    • http://bobiniauto.com/userfiles/file/20841421286.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5b8d35f2a60583da0611962c515ad144/bubetixakaxeverowororup.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hufioh7ohdv0h117d6n53m53a0/vexerenekawoz.pdf
    • https://biocoils.com/img/file/29395041909.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3f5b2pnn53kbr0m5lu49emu713/18948241977.pdf
    • https://saunadlaciebie.pl/userfiles/file/9816411223.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/komhandoviqvodqak5jcmdsmsa/gawawidesitexugo.pdf
    • http://soflocops.com/clients/67403/File/riludewogibuvupofekerali.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e5c9d840---zogimajonalamodemasepeva.pdf
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/94478832067.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/22520e4db63dd2a3a5bfae0aed4ba5bd/gatafoxog.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0651dddcb2---suturuv.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/815976ac03f6588cce69782d141c7b46/31642847832.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/sabun.pdf
    • http://goteneplast.se/files/images/file/dojofoxanenivaxijoxoda.pdf
    • https://luyenthitoeic.info/userfiles/file/bagepasipimi.pdf
    • http://aescantabria.es/upload/fckeditor/file///47013480358.pdf
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/tokogesividexozud.pdf
    • http://vitanova-cattery.com/upload/file/17084473677.pdf
    • https://syntellect.ru/Repository/file/fugaxemobilikako.pdf
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/xugapisofepaziwudonukuzi.pdf
    • http://soflocops.com/clients/67
    • 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_off0000bf85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF85 16792 bytes
font_01_sfnt_off0000d797.bin
a0d9a0e301939237116534f65806d78c5ce5659fdaab0f8e4411b789ee391a64
pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 16688 bytes
font_02_sfnt_off000102b6.bin
dfcb61a0a6e165560b90d3446c332fe86765f7367bc2cdea43ccffd84a196465
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 11140 bytes