Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcbb85f807e26a2…

MALICIOUS

PDF

93.2 KB Created: 2021-08-16 06:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96628e0a3997abfccdc6668b2379f186 SHA-1: a8dc768bda82c16277c951592252a5ae4449227c SHA-256: fdcbb85f807e26a26018f66170c2db6b59d4facbeecfcfa44ab6f3f38181b3b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript points to its use as a delivery mechanism for further malicious content or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://pypconsultores.mx/userfiles/file/xexeve.pdf In PDF document text
    • http://mini-garden.ru/userfiles/file/18640229976.pdfIn PDF document text
    • http://eva.am/files/80a50fbf95b81d17.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/jibujasozepatuvoto.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/40311560125.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074ccb095fb5---gifovejusutotazekex.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/29649607083.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/e6a6de799e54a275bc7d2368e87d0467/vesugavaluraparur.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/79656930275.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/48898553545.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/74498424907.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/fimodonapaliwalopubazo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/migivekusewasilegivutogip.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/silegabak.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/71663431138.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b16473eaec---7110936768.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/22102382263.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/dc4e97b5427ff7f09ed50fb3426282bc/22030532494.pdfIn PDF document text
    • http://valeneighbors.com/userimages/bisofagoto.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/729568blehrpdj5odllb1re2h3/22605459439.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210702_195605.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/sosovagerepimimurabiwamot.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/lurix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=calligraphy+practice+sheets+for+beginners+free+downloadPDF 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_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 17204 bytes
SHA-256: 7c36dd498889b2d9a48369cb4618932e7892412b046dacf10102563d9489be58
font_01_sfnt_off00013288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13288 11268 bytes
SHA-256: 5566a620fead42c1200efc0dfa102f444f89e2f22ec4297ff06b9ae4f3d0a5c6
font_02_sfnt_off00014c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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