Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b37e3e44b621583…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 22:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3fa7f9ec812c720b6351c29e37ed8ec SHA-1: b3c2cd4dc582291a438093f29b302a939810f7c0 SHA-256: 0b37e3e44b6215832f9a946a911e093f46b95476fda276af530d0623afec9af7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm heuristic, indicating an attempt to redirect users to external sites. The presence of embedded JavaScript, flagged by PDF_JS, suggests potential malicious scripting capabilities within the document. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=bbg+beginner+workout+pdf PDF link annotation
    • https://warungmimpishio2.com/contents//files/24202098678.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/77736545266.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/80061049912.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610315412393c---nigiwawebobirurow.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/lavumitokudo.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/40054298979.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/23877679196.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/42675605434.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/vudoj.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/80319407743.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/74528508743.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/48aa50435f243865405514fc4614736c/xazumowezedovavu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609832fde7c4b---82522110957.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108171102508304.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430121657649953.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502005641114197.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/pumigu.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/35177119817.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/fufekepiniwevosubavuvuxur.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/532af206668f7c218f71884cd43869b6/99396269209.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/3056184773.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/36222608862.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/rigolebuwatikodexojivuf.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/82543681754.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b20acc4a---75081411094.pdfIn PDF document text
    • http://medica-brno.com/files/83177416879.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f04ec60d84d80542dfd21a683896438/wawonuxomuwugijut.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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 10768 bytes
SHA-256: c7f7003552c183ca14d585152580183b6cd0b08e03a26db81122097a9a39bc1e
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 17676 bytes
SHA-256: 7b28a01ff29a6958a78743c840c70358b69c13d84daec3f75b11ed1a6af33481
font_02_sfnt_off000123d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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