Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dbbd73db64e807…

MALICIOUS

PDF

89.4 KB Created: 2021-08-02 15:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b658135a3311aa8232f4805b0fa30834 SHA-1: 50537bc15d90014fd5e9fabbb47e0dc28c844073 SHA-256: 36dbbd73db64e8075e12155d782bc3cd8dc7fef35b3e7ce0a47e1fd916a0ddbd
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://normel.org/files/upload/file/85890496708.pdf In PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/21644778599.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bde06615616---63944024441.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/38625544768.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a2bb5f8be---57876234465.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/rerematobavefiruwovotobev.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/gli6v5ipl0l7vhmqmuil8es3dd/xafabakilola.pdfIn PDF document text
    • http://belovosushi.ru/files/88979463311.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/18995596526.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/83155676277.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3835fe093a---69966308856.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f923f7a75bd---24231119952.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f0c004f3---28268030034.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/sebuf.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/36722485812.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2bhtq1aqb335iqud1tt41gjgtk/gexekozuw.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/fejax.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b38f95a049---mixerovexojekuzekem.pdfIn PDF document text
    • http://retrofotr.cz/files/file/70614160921.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/46036819749.pdfIn PDF document text
    • https://majubesar.org/contents//files/67692430050.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160de184328524---bexavodigubig.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/vuzatapumofekav.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/83621760113.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/32185976262.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/tazapisofizawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=joseph+joseph+rice+cooker+directionsPDF 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_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 17032 bytes
SHA-256: 5eaaf09ab9687b0786f609dee16c9eccd152af6ab5a21dc171ef7bc24d1c3c8f
font_01_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 10616 bytes
SHA-256: bd2772a4f7e0b30bf6cbf31906fa962931a5f896adbe35dbe5484398df90aefc
font_02_sfnt_off00013f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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