Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf95dfafe3858cae…

MALICIOUS

PDF

69.4 KB Created: 2021-09-20 09:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2eee8510a3c9efbebe31cac06718b39b SHA-1: 26c8ffdfda98aea6aec158992aae64e500bfb9bf SHA-256: cf95dfafe3858cae6391c0ebca77be70b6cbf38bf05d0cbd44fa3e0f5eecb139
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the document structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://sitoad.com/bbqjoekey/files/202109050148078153.pdf
    • http://szao-spb.ru/images/news/file/zafugobafibufi.pdf
    • http://surausa.com/uploads/files/74154139652.pdf
    • https://ordermorestuff.com/cmsCart/upload/file/67312951608.pdf
    • https://luminex.pl/upload/file/2333179477.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa43abc26---jalevudidumaberedasorog.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/sazesunevorafaboz.pdf
    • http://videocycling.info/files/file/39442951799.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe33eca9f2---ninevuzegekosabamuwesekif.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/59746312934.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161408e755f9f9---zibopobiwemumo.pdf
    • http://air-separation-supplier.com/d/files/44140402014.pdf
    • http://ukrfirework.com/images/file/buforalale.pdf
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/
    • https://keepingscore.org/userfiles/file/88776909780.pdf
    • https://bloomland.com/sites/bloomland.com/files/lelufubapamirunasukogofa.pdf
    • http://norilskgu.ru/userfiles/file/47310960359.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/56928904004.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210916133533.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ad74215d---18732855104.pdf
    • https://mamo-tato.ro/userfiles/file/kotova.pdf
    • http://champagne-marc-chauvet.com/images/files/zemazonoxafusuwodamun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=watch+series+123
    • 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_off0000b1ac.bin
c1abc52c603e2d245f21eec1d5c6c7cbc4b67c3d54692b2e6b1f2a73711a46ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AC 10396 bytes
font_01_sfnt_off0000c97f.bin
6b1427d0306a0ac34bec46b94d27bdd77675e15aed1542f76e3d11df1ce50610		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 15388 bytes
font_02_sfnt_off0000f057.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 16792 bytes

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