Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e989e2c5f80da12…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 11:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c49eade49a585b83b1571119219b8820 SHA-1: ed0d7bf3e2e48af863ebc9fc4b7937afc92fd240 SHA-256: 8e989e2c5f80da1246d77d325ea4b3f43baad8895eb7afaa00a0bf84b7fbd044
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware delivery. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=outlook+calendar+shortcut+android PDF link annotation
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490b08cc8d5---78985834957.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb30a86eec---14784332450.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee77dd0809---jezibakoponumu.pdfIn PDF document text
    • https://migger.dk/userimages/file/mixakafu.pdfIn PDF document text
    • http://schubert-hh.de/image/file/69326954540.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/bewupomixago.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/relisonemamusupixakonaz.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/mijafetulinex.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/50353123871.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/30431329700.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/2915271091.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/somuwuwasid.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/puwemuna.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/voresewot.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/xezogovikofujivinapimi.pdfIn PDF document text
    • http://client.diffuse.info/files/mofewabonozoxapujuduju.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161422d5f51812---lamisedez.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/89523cac0d7e0bae9d00c9d405ebb765/69184652279.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/31654398086.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/41464982940.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a7f170d4cd352b6c15ce5fe0b05c659b/3561032706.pdfIn PDF document text
    • http://villkasz.hu/editor_up/buxepuribekomukudaw.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/vulaxesotetovumaw.pdfIn PDF document text
    • http://allier-genealogie.org/File:/22658629837.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_off0000b2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABC 17496 bytes
SHA-256: a670ebbdad4e8f866fee22551a4960b4e72f66df9aacf9c40d9b3ca58aad2a7a
font_02_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 10684 bytes
SHA-256: b008281f2bb08e29dafe284b58e7d621081d971892cb92d31a16be56083e3099

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