Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73c3bb839162bb9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 21:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2aeafd59c2c5ee9037740fd527f9562 SHA-1: 002c0c548f20df1a453f84b5bba80bac79e84bfb SHA-256: a73c3bb839162bb9a95f05cd49ec07751b7b00d97b95c32804c928f5fd1ea21b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b113f23301---demutozeketapogiwulojadig.pdf In PDF document text
    • http://shiokuda1.com/contents/files/74374229478.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/nefojunetefojo.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109070256027570.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210913141605.pdfIn PDF document text
    • https://tch.lu/files/files/xitavadagonineg.pdfIn PDF document text
    • http://snft.ro/media/file/43985816572.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/6641624775.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/60801725951.pdfIn PDF document text
    • http://samtekelektrik.com/files/tobex.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/fojogosedixotobuwusuje.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5976f077ce724db08c481fc4a26a6b99/69954822510.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/46637665329.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/92786848620.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/fevazezawerasupalevexuxu.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/48525028936.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/77434400996.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/83488543025.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/71624402138.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/luxolitulenosimow.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210901234954.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/xinedesenunos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130228c6eda4---92520844966.pdfIn PDF document text
    • http://abc-tel.ru/data/File/vokoburoderejabeg.pdfIn PDF document text
    • https://ags-car.com/upload/files/39804677798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=remove+email+account+from+android+tabletPDF 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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 17488 bytes
SHA-256: 0293391d58bd3b4665eced77239ae300fa54f905a145ce994b0ed5c3b005bb6b
font_01_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 10820 bytes
SHA-256: bc4c621c4c582c95aa0f83d6c1b28a5d03615d0ac6e21de07b0139919aaf60db
font_02_sfnt_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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