Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ac41889840389b…

MALICIOUS

PDF

111.3 KB Created: 2021-07-13 08:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3d88797ef8ad8204e2a263702c91cb5 SHA-1: a1f1a32e014c69abfde1502d5560502dceec9bcf SHA-256: d8ac41889840389bcd3aa9cf3a1afc740df3b2224c474e01d988ac0529dda662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, designed to lure users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=control+r+not+working+mac
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/338ffe0189383f9f0abb0e7b35e94177/40293773353.pdf
    • http://hy-concrete.ru/d/files/tonesanadatam.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f698650c5---73937989647.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/92036161513.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e9ea06686ebd1589eb9fd1c995e492d1/xogaxajanalepuma.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/00a82470ed965fa77ba95e5f2451f19e/topepemivenida.pdf
    • http://automotiveenergy.cz/userfiles/file/72799950420.pdf
    • http://hjtech.org/admin/upfile/file/dinuzedugujem.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/s5p7uh3jesl8n8vnv9blnaob15/xezarifivufodakovofoba.pdf
    • http://4bzsoftware.com/Images_upload/files/48391491683.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1292bc6a87---81446211284.pdf
    • http://yaqeen-eg.com/userfiles/file/94266938375.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e230f961---30398916115.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607554529da55---nosawoxisozipawopopezog.pdf
    • https://bruceleevideos.org/images/file/26156785135.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a635954ee1c---logiwakotarufu.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9f66d009---67740691495.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b870b6de1---73261391464.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b4cff45958347a9c4e92a1cdb7ea3325/19107396432.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d66014f3---19417153010.pdf
    • http://www.abcklima.hu//data/editorfile/noxajazuwevi.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06cf93be39---fuwefagakunoputejumumat.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4c19enqff7d31v5rsjkdsrne43/86895068084.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e18b4650c5f---79444090779.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090698e38a44---77460929472.pdf
    • 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_off00014f22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F22 16792 bytes
font_01_sfnt_off00016734.bin
30a68c4d0f5c07c49b5a020ed3b79fa4543274da7db91d61bfd7b447903d8f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16734 18808 bytes
font_02_sfnt_off0001982d.bin
9e68b3eb150cce84450a4fb1e45bee55afb61f7347b53212943a0c3b8d43f40d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1982D 10480 bytes

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