Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed64105e218b64e4…

MALICIOUS

PDF

85.1 KB Created: 2021-07-20 21:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68593423d536b6b6f19f73006da4653a SHA-1: 3dfad531f1b92d46e566a3b7f2ec06f8fc957381 SHA-256: ed64105e218b64e4e7fe9b4d1b4128aa45a5d7d4f780a3cfaa2cde6c66e7002e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to potentially compromised websites and employs a social engineering tactic by luring the user to install a browser extension or update. While no scripts were explicitly extracted, the nature of the links and the heuristic firings suggest it is designed to lead the user to a malicious site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/r70f35d93hrn1k16cdfqaokq86/38505592741.pdf In PDF document text
    • https://aplusadvance.com/naver_editor/data/file/lufisolofometodixuwufumat.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/fenetixo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba058e502e---gerubekawewelepesebi.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/3528802807.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6843dbd8f79aed30c5c88bdc7128c855/nofibugejafezidotiwifam.pdfIn PDF document text
    • http://samtekelektrik.com/files/duxadif.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/rtsda6dlbnhpsc9f85n0d90von/49531341914.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160807071b8d61---mubokep.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/raperuwudekug.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/10311546732.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/jofevepexedenom.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074164b445d3---33478719586.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/4rru6bse43p060h9524no0hn41/xenamilipatetamusugo.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/70009432211.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0a14cf12ed71eaeb1731a1ea237ad39e/9515286529.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ccbe77fe2---sanapigo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/40411125997.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c19d66316---lodidewuvatex.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/6699160364.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/14b1b04dfaf146682a64a261b1a660b0/86395151545.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/lurexakivo.pdfIn PDF document text
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/93354444988.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/89799966518.pdfIn PDF document text
    • https://cecprint.com/images/file/49747401582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=combine+pdfs+os+xPDF 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_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 16948 bytes
SHA-256: 2739896a720071d94a016bc3decaa7fd3fd15c4c0632bd02e28f17152b160531
font_02_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 10528 bytes
SHA-256: 630c65d30c41db2d875fadf21a6f6a4c441df5b401c81741c2d264ad582e7804

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