Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4a1f0fd997b17e…

MALICIOUS

PDF

89.2 KB Created: 2021-07-06 07:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ea31fd7ebd58dc0d0c82de229856024 SHA-1: 3ac8ef662643be0a9ec8533b4a764a617d65dad8 SHA-256: df4a1f0fd997b17eb2a93cf44429fc948c34614d02d8d7cd207054e6828b2eb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites and other domains, many of which host further PDF files. This structure is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://pm-ural.com/uploads/files/nizel.pdf In PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/9ec52a2c312617c3fd24cbe8f67d8203/leteribikifatikaku.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/607d4ea7ed65d2f9511e050ef468fa42/98731661729.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ae5e37dd571af60289e94c563565b740/paxivowisukijusewij.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210518195951.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e0691751c65f8ae897dc508719e3c926/80305105828.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cmikbuksd78s819usor33iko43/63382595905.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/cmrgol9p0s7vvenn8nk3mtlsm8/limabogiwizuzefimasen.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b91a67c63f2fa41045e79b958d63ff5e/ludos.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/okqugqvflf7t78eh341vjd2hnp/83575462074.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4dsdaogo9spgtsetsera7n4et2/1931112093.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3f6058a0---loforimebefoxojawubodi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f32d6a9a---jelilubulamadak.pdfIn PDF document text
    • https://akemi.ro/hirek/file/toxukevovabav.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/90020395600.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083655869798---13018421355.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6e3b1ff9---44131398973.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/faa459963bd400648ae15fbb6a77700d/75337089961.pdfIn PDF document text
    • https://faceless.me/userfiles/files/59824220861.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/fusajofepavolenuwalosad.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/83087873143.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/jimonufedu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0mqeobg83foi8lovng1rbocsfc/40057058681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=boxer+pointer+mix+puppies+for+salePDF link annotation
    • 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_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 10772 bytes
SHA-256: 8ad1c0d40ede6feda6e4bb063fd52735d238cf6fc636aa199188fa88f735efa0
font_01_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 17072 bytes
SHA-256: e68ede0c606476876882b6a9371ea0f3327aec309ff127bcf3a459b59020a37d
font_02_sfnt_off00013f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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