Malicious PDF — malware analysis report

Static analysis result for SHA-256 014cea8523b54440…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 12:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffc005f12616832b258ac8cc53973f51 SHA-1: 1ea0c8e9160d7e6399eb21c862da49e942c45856 SHA-256: 014cea8523b54440d9010bd365402a049de10bea6e35dd2cd24c9df9c0997078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true destination or spread malicious content across multiple sites. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=capital+punishment+history+pdf PDF link annotation
    • https://www.alugutader.fr/ckfinder/userfiles/files/428321436.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fde79f7c3---17958056229.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10498283928.pdfIn PDF document text
    • http://technocom.pl/editor/file/panux.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/91323232293.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23294654373.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/75052378332.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b580b669bfb---39357811876.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc337de482---lazuvanatu.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/kolasabilosotemumi.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/93384590141.pdfIn PDF document text
    • https://afayl.com/userfiles/file/zazaparo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e3d8fabab3051b3d6eec8b723f7c6570/sufipumeduparigujoka.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ead0f8df7e509c9ff6ad5752e0c5e4ee/91028965094.pdfIn PDF document text
    • https://cncunse.com/d/files/xamuwenelapekak.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d192750adde8d12f3cec301858fdd11c/79761337997.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/rifelaxopixesagepurezuvol.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/98435567553.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/rovigetalakigoruta.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161137f263be27---18046665527.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c40a4a473---19550309210.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/53613629851.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/n0b4522r3m0e7ei8cc6ugj7rkb/taditu.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/50997886477.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_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 11008 bytes
SHA-256: 41b8b738b6f3ebecc6dca51a7f25942df1e4c9c00a2af3b1447605f0e9e49039
font_01_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 16644 bytes
SHA-256: a88abde6c4de36f2f1f8fb5b8466ad39ece123855a403694048a3615498ab7ac
font_02_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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