Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5b7e3ddaa33fd4…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 08:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55bfea3e1f2fb45b080c77547de3b3fc SHA-1: 5edf0280fcd52bc39a82551023809efaf1205265 SHA-256: 0a5b7e3ddaa33fd4d0b538671136242c8a416608020fea0d5e98e553ac064968
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the link farm strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=color+by+numbers+free+printable+worksheets PDF link annotation
    • http://tgroupsrl.com/userfiles/files/20366298054.pdfIn PDF document text
    • http://honda-vo.com/upload/file/juferuwumuresirevawab.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/vugixefelufab.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/zoken.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9isthvosubn8esae55ichmqjfa/60948767325.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/15403362685.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/184b8b310dbe9b99ba3968e6d0960cef/54709153566.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/rusakud.pdfIn PDF document text
    • http://air-ned.com/uploads/files/72804003605.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/6ra09d79uo83fs5herfi0e6c61/82493681579.pdfIn PDF document text
    • http://malifer.hu/upload/file/vasenamelesufab.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/92244577019.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161143f788e010---nonoletixapemowobamolifip.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/74329185965.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecc89a98a---tutov.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/dijamupesaxokofon.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f50dd45f---25134203107.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704cacbf1c9---10215322045.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160810f696381f---xitup.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983d17ad4e5---pexegumasepili.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985b3601374---33335536133.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f0db8afb5ea57be59fee49aeda741dd7/47485634982.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/2372472430.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_off0000ba35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA35 11184 bytes
SHA-256: c4e903b140e9649759a3e14abf1e39e3af855fd55df022d24361ac483c701906
font_01_sfnt_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 15820 bytes
SHA-256: daa48bf1dfb95109c1305a63a4b79e6442b484aadd7bd96d23b7c814bb846335
font_02_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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