Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c82912fead8a0a4…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 10:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24188341d7b018d5115421eca8f4d06b SHA-1: b4bb84a2808beba9687a00bb46d21550c1522fc2 SHA-256: 9c82912fead8a0a48b1a5810be19951158f66b40df59e81a3e085520a3efba64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple compromised CMS upload links indicates a pattern of hosting malicious files on seemingly legitimate but compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772c0144319---fugobaxen.pdf
    • https://costabravas.com/uploads/localidades/files/sisupatisuduxemojuwi.pdf
    • http://goref.ru/files/file/tinugupik.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5a8oet08joqppt0gt4j7u0f4pd/wuwiramemeramo.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092da1d89491---pezinefodemavoledi.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/a1bdlggb0r58nlcg38iif853if/29634283326.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/vg8glesjok5628i7b5g1ot7tig/kedumonegirujalapuwavo.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/favudinow.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e499676f31155b7b900d976785f7cd75/9463469905.pdf
    • http://abwmarlboropike.com/uploads/files/48700951124.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/poogk4j869e23qhg702p0m29r0/jijujejoxukup.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/36b329a1d43c9b9ccc27781a9d19b669/bomawipasitasazes.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16082db8abf759---43681024960.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd26b397f3c---kazozenogij.pdf
    • https://europartner2.pl/uploads/puwevukadaminojafuk.pdf
    • http://changju-hotel.com/CKEdit/upload/files/35340462836.pdf
    • http://unseenadventure.com/userfiles/file/74035450056.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b748a472f4fbe9bcf6e287fd3d7aed67/65042704750.pdf
    • http://marcobernini.it/userfiles/files/36145384225.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2674cc7b---53750078359.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cf9f6442e80a74746e86daeedb3daba7/6370855133.pdf
    • https://wrd13.com/force/file/wekowiruv.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607594c32ea1c---lanegurogejadi.pdf
    • http://pttaccounting.com/userfiles/files/kixepugejudivigopudo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+find+average+net+force
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b7.bin
c0c16364fe3726ae7cf76612f2c326b6b28936717ebd7e8829451e5c54605ec8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 10580 bytes
font_01_sfnt_off0000fdca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 16792 bytes
font_02_sfnt_off000115dc.bin
a7102205a7d1a30d840fdb8496e20dc3b697ff26532cb7ea8c7006f7898a7687
pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 17324 bytes