Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91b8bd465ea639a…

MALICIOUS

PDF

77.9 KB Created: 2021-07-30 14:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d4c6ed08f19b74574e625d3247a8e235 SHA-1: 1f66a04de5424d8a3bb3ca806b78c764f54759f8 SHA-256: a91b8bd465ea639a04b60a39f29ecf7df876d82497ddeee49ac73cfe14144114
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, many of which host further PDF files. This behavior is indicative of a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076bca69623a---japozanajarabavepotaxopib.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0adec248d1e42f5fd37678296f0d76a8/95786852547.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608844e822cf1---81614524983.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/2912331233.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/kanotomodizuniba.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e358bb1a96b---pezuxadasusawo.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/fejixewaxodadixipudame.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/17894894363.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/waditeradiwuwavuwiluve.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/42053404252.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cfa585fb5---75967560298.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/tumewuwonise.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e07ad1210b9106169484a2eed62956f2/pikufawonemabafem.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/7be52e47915e15a7057c094f27d3c52d/denerirevexurufeviteve.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qkem96s8ck06eiunn96ga5t5f4/73315353033.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/retomijusexozet.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/d178cddf5b06cb9637fb87ef1c945d86/7188835290.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ec6d0db0f76d026803fe16ab27347f6f/zekig.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609339e149cc7---kutonubijuxedapasa.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/431ge5h6j7157h23lf7h3hikpb/69017627099.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/42087507695.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qprd745nu8imj5h9sksq0cnbfj/wupopatalugigosuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+install+intermatic+timer+switchPDF 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_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 10572 bytes
SHA-256: 36b24d4c7a31ed026907bfa6631f44d1bd025bb9593dc1d3657e5e7a62d324f2
font_01_sfnt_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 17040 bytes
SHA-256: b514a850d417654dd02719dbab3e7bdd79c1d3bd59388ea86f3ad89e44e3690b
font_02_sfnt_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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