Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4eb43f58bdf82b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 22:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50da28b42f39c248438ebe3bbb7808b1 SHA-1: fb153456e4a159504519314c8b13a8e927d0bb81 SHA-256: af4eb43f58bdf82b3bad51e4a82adca55db169f7c93aa787a54d96c6028a1811
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links suggests a link farm designed to obscure the ultimate destination or to spread malicious content across multiple compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.coverseg.com/uploads/ckfinder/files/32448664364.pdf In PDF document text
    • https://yaslibakicisi.net/userfiles/file/24695007056.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/49013637742.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39e3373db---17558765844.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9b4d92707---logesajugubagovizapale.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/pedasoguzerejisiditaduxi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e723b2af---38118026294.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68b58bfd04---malemamumowetewigu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9d364466---88268997950.pdfIn PDF document text
    • https://jobtiara.com/files/files/radimadodomatimonano.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0d97c9c0f---tikevimusapifiged.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/39449375754.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210727115628.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/vudugiva.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ukuco7ph03e2dts2jnj554fk4o/miritonebofakegaledafa.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/77302020107.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/96478069071.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/dilefumov.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3755dd5c5d---3960188892.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/36678047417.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/67543785291.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160702e1d89e8a---rumadobaraxenozivipad.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094859a92788---lamikumazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=migatronic+pi+200+manualPDF 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_off0000d137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 17548 bytes
SHA-256: e1de2ab03f17dc4376ea1929d91f8bb8a9d76fc0c790997700d1acd3b51cf90d
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 10752 bytes
SHA-256: 04f9d36c13db1f23e96a5a1752804bff0d818946f7b54ba9e871ae9860d733b9

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