Malicious PDF — malware analysis report

Static analysis result for SHA-256 955c4bc3f755754d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 15:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: daae1b812ec43b0b163b041da4c820ca SHA-1: 3694470e0ff840f0d00b2f0daaa7780c5c8b4ed1 SHA-256: 955c4bc3f755754dc17029804e85275170a054af47978d9817be1a51ff4640e6
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b58441c7b56---69604235821.pdf In PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b80d86e1---34061362538.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/zogasagisaxotakuke.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be26ba83458---23833270004.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/49937308438.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/37253958561.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/19053799050.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/nawuzerevafekezode.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b230a15b3d842d18b072cfe8b1e51b3c/5403264268.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/xarol.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/14033189423.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee0bbb79d---xawebopiwararew.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/36aed4b99f18fc7d9583e51fc93c872a/xenekaj.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097065268362---pevuxavilojikebewi.pdfIn PDF document text
    • http://ecole.ru/text/images/file/nijefesefidukinalufilu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/jowig.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0a95ebad0e9533cd89ca15e2ad2a4a0d/ziwopotexujofosoxudiso.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/legetitazozotexidov.pdfIn PDF document text
    • http://ipceurope.com/assets/file/bijoj.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c901683de51---xapinadivofilapejibepap.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/60410019529.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/75377888217.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/28445894092.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/tr86q2umfteqrtn8tia1rns0e5/vulojelif.pdfIn PDF document text
    • http://allycatering.com/userfiles/dofes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=baby+boy+name+book+pdfPDF 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_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 17680 bytes
SHA-256: de0a3280a45e353491321c3c54548dc4f7875c4808e2edd2c192beabcba5792c
font_01_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 10556 bytes
SHA-256: 1411cb349287c72c6c1f48f9b1cecd1f94233692c3e62ab4f444b7e470fff877
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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