Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1669e677c0244e…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 17:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4896c72fea3fe74cb3b56944a1e4680a SHA-1: ac4e832ade835cdbe99b7e2324d6a45d08568a32 SHA-256: 9e1669e677c0244e705f651c15f3253505e217bfe8f44a8166bf0c44858131ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous links on potentially untrusted domains, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of multiple external URIs and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://medvor.ru/uplcv?utm_term=sing+in+windowslive PDF link annotation
    • https://haidangpc.com/contents/files/53592089358.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/2386338899.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210912015652.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090304465786.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/8136341924.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/44s6novc8nnk73kmd0m0bvj8nd/podetuvigejudurotovosuva.pdfIn PDF document text
    • http://ed-union05.ru/files/file/17016323615.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/dijoxilidomisisaxim.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/92870957780.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/mubukosatix.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64d52e4dd---regosojugiruneremagix.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/naxobamefoborado.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/eb6qp0jgmvu03ncjvmp0cm3lop/wasunugofewo.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/jegiwimedefuvibejoremekoz.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/7203571794.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/sokigamigekatobej.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/rogukunikojexupomufim.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021914110288975.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/28342837583.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141594ddcb58---98973702239.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/96701180415.pdfIn PDF document text
    • http://bptramptour.pl/files/file/jiwutipiwiwupumifitarebe.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/gijisuxivopawam.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_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 10288 bytes
SHA-256: 35802c432224302f384b6f6599340284c3d0bb2536170920f8eea71aff971084
font_02_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 17156 bytes
SHA-256: 161b6761be1a07682ce199481935efb61ea24b31075151fe8f79bebc1661cccd

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