Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b7594271eff467…

MALICIOUS

PDF

89.3 KB Created: 2021-09-08 00:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1742925634a28c2de1d91beb7a010527 SHA-1: bbeadd830c8c79d83b28147b2d9da72fa023f504 SHA-256: 11b7594271eff467a8a1e376492231bfff73bd54cdac37a2cbf88f64d5131174
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body is unreadable, but the heuristic findings strongly suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c680f065e6a9f28234180ab8ea4c96a7/werukobebi.pdf In PDF document text
    • https://sayurhijau.com/contents//files/73147340879.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/38165534715.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0b38f16bef4a32c4ca1f0d5212952de1/64764807062.pdfIn PDF document text
    • http://zeci.nl/im/image/jiwinimelikejevekemozadov.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/puripaxaxobu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082104ed6769---59580484717.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/lidetifuxirivomabavaz.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/11228747032.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16113898b88ec6---vipijasunojisigofatu.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-08-09/0c878f283dbab052bd2e5eb545f54e9a.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e60b98aa66132c05248f0013dc7846ee/jetorosaridimamageriv.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/kuvovaxi.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/suzenerekiwatij.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c5bece918---94756764953.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/kewizekema.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfccc32151---23049707305.pdfIn PDF document text
    • http://staropolski.net/Upload/file/fusagigexujakaputi.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/bf026067924bbc4de854941ffe01d1f9/wujof.pdfIn PDF document text
    • http://gerocuki.hu/user/file/2914720486.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607395678be5f---pijagew.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/e785bd81e47e9e51d8eb8d038a29addd/83504893060.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/dezimivakigexupam.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/31fue70llcbntr85n7ha8pedjp/87442626567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=convulsiones+neonatales+2018+pdfPDF 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_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 11092 bytes
SHA-256: 681c15f451687d99a12f7c2268ce399238c0545c5f5e9d045fd3a119b5180b00
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A9 18072 bytes
SHA-256: 6fd7015dbe82d97d2898948d7a8fe747d43a517f548dccab2dae6875852aacff

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