Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec51b386e713894…

MALICIOUS

PDF

88.8 KB Created: 2021-09-10 07:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6f27c54a60dd0835b44c169b37d8808 SHA-1: 0ca844a88ca75cb5df0bc1f125fb4befd9b1627f SHA-256: 8ec51b386e7138949902be5b9dd797929da4c70f0ccea37b86a5780a95c3c141
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that function as a link farm, directing users to external websites. Several of these URLs point to compromised WordPress upload storage, indicating a potential distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=the+walking+dead+webisodes+torn+apart+watch+online PDF link annotation
    • https://rent-1.es/ckfinder/userfiles/files/tapuzodegijajejedur.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/555984466.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/93608896566.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/nivebasikasumitov.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/taxelatoloremogimeg.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/tabomemajera.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/tisunugamolazufotobotubol.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/jusimapupe.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/xozopemudejusamosomiguw.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea1fe4e8d---zowofujomaropoxobake.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/10614426326.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/tusomeno.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/62c3c60e5cdf98bede8aa9098882164f/44673091173.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/57808475828.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bab8f543af0188c13bf5123a33bc89d9/wanabinebekoresosusut.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/76514215409.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/77762129298.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/juxagijurowirakano.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/bidijuv.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/25942968440.pdfIn PDF document text
    • http://saaretravel.ee/images/file/65509736126.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/99650707873.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 11076 bytes
SHA-256: ebcc9b910350ee7ddd56f9684cb697db7b29159fd8d5df6110434033684ade17
font_01_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 19136 bytes
SHA-256: 09441571d79bde434c2ece61fea39fde5c2383fa99891bdf2dac18b5c9512241
font_02_sfnt_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1