Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb394605cd621c1…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 22:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0b12abfe93c5b3bbfbf6098285db048 SHA-1: 7d0424ec36a0e23fea797436c6977370ee937e0f SHA-256: deb394605cd621c19eb64a60cb9e140e3c9d7a0ade90a0388edd8688e6a3a1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a common PDF-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=wood+carving+merit+badge+workbook+pdf PDF link annotation
    • http://architettoseneca.com/userfiles/files/movaxikusaz.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/80445237162.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/9f6572de8e46af4ac8b52486ce098f06/belewivi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/deea70133fdc699e8021b34d61566a18/89618531755.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/20966850052.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/burobiwutejotofobetesu.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/kosexolasabemapogosomikev.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/lorobojopibegegavajevi.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7556d726596d0da75342ef48586b335b/vipuxaxemuxivomopunem.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/53464616969.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/91665953620.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/15776421459.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc789b09a8---9571092771.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6db57153a57e44bd3943458d70e438d9/zoxixiduw.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/faluk.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd993ba0de0---wuwuta.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/tutegapuko.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/dagidumugujixa.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/turewufevof.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210817_030127.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d00c656acff---pugodi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/nm6lkcg4bc4ceaaus8lgqadub3/2285114503.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/b0sa6bo537fbf1vsqnpcfuiil7/62503233365.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_off0000c94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94B 11128 bytes
SHA-256: 7c1513721e3d86f6fb23615d4a4ec0a47968f601091cdc875ef47cc76c609f9f
font_01_sfnt_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 17852 bytes
SHA-256: ee7d781136aca67b2613dc386bbe3dc5c5e2c1a34edf8983f37b7df0061a7695

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