Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c8277ca92def0c…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 21:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a7b3e157c294247ec2e3da39aed24c9 SHA-1: 90b02102b1f9f47eeb966fe249745b7a01a35867 SHA-256: 29c8277ca92def0cf7a3dae06165febc70c03755f3230caac560e7e1e4d17e28
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://accessiblevehicleservices.com/userfiles/file/26576510858.pdf In PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/6858249070.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/jelazexones.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef173c803---16147892801.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/95176831881.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d77cd0ad07ce92ba6a4e42e2f3ea0a80/mikelemagitezomupu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/on0rgfv02tijg0ooc7a5trrm97/23593900753.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/sesobisubudurujanavu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/daeaabcc584b2ec80cd0a05250bc768e/lofut.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/mumitovoga.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7335a9cee---16053570496.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/71925953934.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/69386396956.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3ik2st12cj4g2jqt2ssohs4870/dusajunagoxopebefibugik.pdfIn PDF document text
    • http://okvin.org/userfiles/file/96607237871.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/46723364101.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/86815912725.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/99214797534.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b36fcd520---kodizazerarari.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/7534668784.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/weregavemiligapububawi.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1bf741c18---53783701677.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/88164244167.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/61383771158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=apache+spark+tutorial+java+pdfPDF 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_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 10984 bytes
SHA-256: c7135eda62ab14ad472493cd2bd25bc63c280d2ab9f45a80cfcf786b03cf7aab
font_01_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 17348 bytes
SHA-256: 410cc91b5a6ae5d6abc11780f6c341c995214906940c348a9a89aa88031865ed
font_02_sfnt_off000132c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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