Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd2a39956776a80…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 18:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15b03d9fceb53a6b8ae3a34d9ae5620a SHA-1: 6cdc5533923d76a0369c65a94b3ecb7f0d734cbf SHA-256: 0fd2a39956776a80b3f63d3a0e781088c3d6df09697d48db39edad0c853e35ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tskrea.com/userfiles/file/32710155547.pdf In PDF document text
    • http://musicpark-live.com/userfiles/file/vanosorerifa.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/79172907287.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/33798285248.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/72195720288.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xofikotuf.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42807bd42---75766457185.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/26003379044.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/49448978381.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/vapalawujoxaku.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/talix.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/xebukusexa.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/96995543331.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba378418be---91927461116.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d425a049---finufe.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/27230978914.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/modugibikipakubevitixed.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/80043371583.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/lesowetigexemonepoxupaxef.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/412622799.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/belezalisedozawodujuloz.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/lafixuxubopufuwigapumomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=lenovo+zuk+z1+custom+romPDF 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_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 17872 bytes
SHA-256: 1b2f8a8f4fba40b6161366d43440a4aaae94a2fc05701e266659fc962893ef55
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 10420 bytes
SHA-256: da2fcad833ed9dbd01f0bb8835c799d64560042fb3a323bf426ce3ba6d613743

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