Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf61b2f82271627…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 17:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c9b96284ffbbf82bd01b3277cac8d7f1 SHA-1: 25232a5b39ca6788520538c96c17d51a64ffff24 SHA-256: 9cf61b2f82271627ac4b8c984af3f9cd1eb61b36178a7b3d73e73f4c29560aa4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://svingenieria.cl/userfiles/file/19166750760.pdf In PDF document text
    • https://murtenhof.ch/userfiles/files/8100500689.pdfIn PDF document text
    • https://mavibusiness.it/file/redejifasuvanovivalur.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/36584137e6ab68d269b3199436c456bd/96287674437.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/72596835506.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/tavakenulotojojituju.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/79724241960.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/57772808394.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1628919805.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ea7fc714f598a3f3c3f77428298fa8f3/subufuvokizugevoref.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d0aa1e684c2---giseleja.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/pe48f699okbneivd2c484bnm9t/26251852885.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/asappl1ljm7eegfik9g71ensq2/14570056122.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/66396246395.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/39633078992.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xidunuwogupisus.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd593b9e27---gefubuwukekomalekafugufat.pdfIn PDF document text
    • http://www.moyekolodin.com/files/4384179108.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d6030a68833---40743338098.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/552e0c326b75513ba9e7e28e426c544d/godalijefupimozirapep.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/18510868961.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/lifukozovulijod.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f870c66053906d7fd9617bd367077e3b/rifurisitanubobebowedosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=underwood+typewriter+manual+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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16564 bytes
SHA-256: 9f3259986faa33f5919968b55c8cc6201bb1c61e82cc5b4a82d59e9cc7c5af30
font_02_sfnt_off00011935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11935 10800 bytes
SHA-256: 3a6d28f8475f7d859a8bc742d48f5c0bfd00556aa855b783f580d288718c59b0

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