Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8692de2d6582c5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 01:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b382e18b31b1717dff9a9bcd8b54924a SHA-1: f30f49ff99fb0aeb16ff7a77616bea6ed6e9d938 SHA-256: da8692de2d6582c5e9caac4f5b5d7cdc95b2a5f3d0857d723f8fa827f7b941fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that has been flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that this PDF is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=how+should+a+bra+fit+in+the+back PDF link annotation
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f6aac45f---relijixitixebasojalasubo.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/serixil.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/r6ul021a6s06s18j54oqq5qhib/masono.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b15b1d332ba---3048211160.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/17211071103.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/nokijojibibubuvarubapusev.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607782e5d46eb---lumola.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/73643394932.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/62093339500.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c853f562a85---66505988943.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/ronov.pdfIn PDF document text
    • https://x-software.cz/data/file/31727000027.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/narawojuwu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/euodj25e2ea0r667tr7ssvmds3/3854636527.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a178644b70---madukezojab.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/wenuvosobibugijimib.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/wuzovefivejar.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/3u25sfagvh2lk1lm2egaqf8n9p/gerikuv.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607385a23727b---ludobozikolajojuwiti.pdfIn PDF document text
    • http://valeneighbors.com/userimages/45396425557.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/morativajad.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc16adb334---woperefevapekobenife.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/91378511607.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/39060482077.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_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 10984 bytes
SHA-256: 807cd78480821e23114d3de9fe29d16eea706109f99fd97e19677e87d81f2bc4
font_02_sfnt_off00011518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11518 18452 bytes
SHA-256: a5968feee034b9980750ca94cfa4605d45c7055cb8b9524f31ac27011fa7b3bf

Open this report in the interactive analyzer, or submit your own file for analysis.