Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d9c8890ceef4b3…

MALICIOUS

PDF

83.4 KB Created: 2021-07-03 15:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46d86fb64f7797cca95ddd5015a8fe2f SHA-1: 20876907ea59b8d458d6e6a9bdf9361de99af1cc SHA-256: b2d9c8890ceef4b315e6645a7d0985c0af584f135ad4edbdf4a8ee83e6e32b42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs are indicative of a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://acrgroup.nl/userfiles/file/zojogezopumolibidivi.pdf In PDF document text
    • https://kompaspt1.com/contents//files/ximiripu.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/52556deabff96b710f62e3f5855c9012/laveposulonetokiwikoxoru.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/puriwafojozorawukupejonik.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/32fefd0fca41ab2139a75f611b1c3166/zupazigexasewiguxakob.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607840aaedad7---28761677400.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e98d98841f---6122167513.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/vetevifuvazokifikasaza.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84nf8b2qvuem4st0b7dadtef23/95711644227.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/30885dbcbe0384774b9078b201d7f1d9/56937572581.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/lefetuv.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/57896824921.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/51812975064.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0bd65208---24951135707.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/mugumivelawufumorexoxe.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/49828705874.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4609d984f7---dujusato.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/78101797556.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/46372629026.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/rimaxafixovom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=figure+it+out+yourself+meaningPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d1bbd643ce177f1a6fd7c77fddbf3226/gatelilunowuzerukeru.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_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 17032 bytes
SHA-256: 3bdb32752e0483576c8d9ef02d21cecf8d0c0de824840aad14f207da06143c00
font_02_sfnt_off0001265b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 10748 bytes
SHA-256: c807e06f25f374390af2ced48e21b109b41c6c324e05afb9c38f67cb53e690f8

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