Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce6cbce59901861…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 17:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca9b2ccffec4dd5e5c44bc98312ca5b3 SHA-1: 676a3c80e5325344b857f3e45be1f05cb39c55ed SHA-256: bce6cbce59901861fa2c87253f3ade2b4e561931b7bb81d4edb55fd63279a227
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised CMS uploads and disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://studioingegneramato.com/userfiles/files/75255379210.pdf In PDF document text
    • http://tianlanip.com/filespath/files/20210903065553.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210905000313.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/39110814117.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/5847435215.pdfIn PDF document text
    • https://jin-ji.com/upload/files/29408603672.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/76352267801.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/15998433105.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/61323289718.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/69827986747.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/vonaxexe.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/63330881788.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c126649bc---76494539953.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/81446925300.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/85025593461.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/kapexolabut.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/48a52a53f68d4f5f6327bad17090f74f/liwuwe.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/725a3b4314dc80192b8e1386c08ce936/36754966418.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/27695946402.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/47inc6b5m6arv3g88ej87muc5m/46196040171.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/34637446452.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/19162870095.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613815fa6629d---32677579224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+tactical+rpg+androidPDF 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_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 18236 bytes
SHA-256: e30082123e2091b8436071c69c69a21e04090dd74bd1133682127424cb7ec5ac
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 10744 bytes
SHA-256: f961ec7ba3df63abf6797008ac395ca7acf549571f8cde2eca083ef475ec4318

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