Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5d6b590c75baea…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 12:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 18e1d1cc59c5fb52a91c32376ffe2005 SHA-1: 781c2082c52c700f4a63e4886dbdcda7ef36d13a SHA-256: 8a5d6b590c75baeaa0334e5b42e80d35a4880ac2e17a31b13eef013f294ffcfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF link farms and the overall detection profile strongly indicate a phishing or malware distribution attempt.

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 http://imhkayseri.com/resimler/files/80888011993.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaaf65f774---66150424631.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a7ae6d6d---3300452338.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6404b71f5---bozadu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1943630c---lowuto.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1d98b3574f327c81b104523c5ddeca7/19574912171.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/buwevebisevemu.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/todofedeloviselaparawo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7fc80b461---34509114909.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34467214915.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/35694933126.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/gawetelivemunoditotoweg.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160879179a3ec7---nemilowok.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/wimuramewaziga.pdfIn PDF document text
    • https://granitnet.hu/editor_up/novusu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kb5dacs46j06ugef18rp2lgg94/87992629326.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a75a82605---92891337222.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/gozurokavi.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/jufepobipogudexojerozalef.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d15d09e59---28652073986.pdfIn PDF document text
    • http://winso.tw/userfiles/file/78791208308.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/68554662451.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/wodavijaj.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/volabowitesus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sbi+bpcl+credit+card+brochure+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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 10760 bytes
SHA-256: 4f1286703dd63ca35f89e1207f168f6a2dfaa44e1c807c926b4a5cbfeba2c686
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 17784 bytes
SHA-256: 44122be04ff23739f6232eb7f7b58f61303bf1528690c78bc90f8f1951265347

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