Malicious PDF — malware analysis report

Static analysis result for SHA-256 43172fa7d4c20eec…

MALICIOUS

PDF

84.0 KB Created: 2021-07-03 09:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1ec763c9b8d576bd338a20f072486f42 SHA-1: dcf14777a5f1355caf8611eb8015ce7da95b2819 SHA-256: 43172fa7d4c20eece20d1c2efffd05e781ecae7ba943a6625480b9e6567308c3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=scalar+and+vector+product+of+vectors PDF link annotation
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2b529a3ccf674957734c7c2ad0a6c0d5/jomenena.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d6a7367ac---33540308614.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf5a29e130---96171110526.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/08112128010c4e7a4f3287e8949c8278/13458000459.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2966738c---99669789646.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8fc903d8cf85ad8604a9f2ca1e3dea7b/nuxatotulobimenolozur.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/d0582dmtv07hull021v52aogf3/66575630443.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8ba855b0---dalebibexajamiv.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c7d2dc1a6---xitafux.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/0ddec44cff7f29973ad622bb564bc573/55922812131.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/damilo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd36f830da---83892918820.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746db04bdfb---74862656233.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/japepuva.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/bikomoxevutozinepo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7827ad8476---17740036706.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/todikijunovupuk.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/zavumodetubigo.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c48ff20cd---23986005785.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/defefebavoxo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97441816e2---zevodipiliwajavu.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/rojuzutirokebip.pdfIn PDF document text
    • 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_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 10760 bytes
SHA-256: 9bb7a1d26f2a02a95cbb291f05fd50b811edc6e05f3785f6d1d9c665cba84644
font_01_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 18100 bytes
SHA-256: fa2be3dadb48f58b3e90bdeb2e9ed31de4127ceefaf4c3d194d6f05c8bd6f82a
font_02_sfnt_off00012a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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