Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefc50261a983d6a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 11:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b4d79e8873706bd19339e7c42b434c4 SHA-1: 5695082463322048970a98cea4e2714d918fd28d SHA-256: fefc50261a983d6aca776e17cbf4211ba54ced3dfd7d2691eb589d252b39431e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL analysis point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://its-bulgaria.bg/files/file/powonawevevemanidev.pdf In PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/mexemuvezozinixesuliz.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2010e0c0871733cea0d23c1175af894a/24477788455.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/pulederapekekajox.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/towofudomufotakixusukok.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/zazawuwisutuzibeneto.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jeb2fr2tmnauttoa9ucsscab37/89102411779.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bce65eb3f4cc7b4ca9c0c0440b6d84f/numewukipej.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2ohjja12adfe3j2mg6jcv43o30/xixugujogo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966eefa3bc3---97301347987.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/rarigorijunujifupofoximad.pdfIn PDF document text
    • http://ceroki.com/image/files/94065134870.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead1be43b5---42344936621.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/88262291741.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31663726255.pdfIn PDF document text
    • http://strandedtattoo.net/file/38145167437.pdfIn PDF document text
    • https://activepymes.com/pub/file/90472967346.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/7ec8101d787d16c8083bf327330205d3/29003771221.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84e0e9e66d---zarigo.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/xojakixenenonuwosunedili.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/maniranavalarosovepezo.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/30d81c1eeb38845445fabf616132575a/nigodugezenam.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/lereve.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/328e26319a8c8f07a6304f989f76d238/56684614176.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/98658611857.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d932190deeb---11738754577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=know+your+worth+book+pdf+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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 10728 bytes
SHA-256: dd3330d4d7e87f71d6dcd4088466565292ae938f2172456bc40bdda1e52eb744
font_02_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 17480 bytes
SHA-256: 31831533ce0aa016acdcc950f218de43fe7936949922d783af7493a537bf931b

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