Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f2012eb4f09116…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 11:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a97919f934bc7c7299027fcbedf8692 SHA-1: f3e07f37e77ab872637afc3f2d93736a88c1c880 SHA-256: d3f2012eb4f091163c7fb21825a0ef6f5bf35aa66139c6600fe2be55da9b2648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and numerous external links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://geodavidepini.it/userfiles/files/69534154531.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e17b88e5fd---9120233854.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a11fb932f21---xexijuluwixilagekudas.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/43713905174.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e902adcfac3c116ce32d8def136fd4a4/nezejogezobemumowuga.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/16656482417.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/woseleta.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/3bf33c52cebbd319f071ffb4b93ce513/89733537009.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210514190617.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ca2bee6c3cbad2ace78b262bd74aa203/mudaxuxi.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210803025647_kol4p7.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/xizulukinulitamu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffa05357d---66107948553.pdfIn PDF document text
    • http://citra.cl/userfiles/file/67321923400.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5f124ff2e6f221c17d5ee84a6da7ab4d/nubugozomaxaxonow.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/48583094755.pdfIn PDF document text
    • https://discoverthesky.it/file/jovofadosuwibo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/zezolosazafa.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/72ae4c10f4c28c9304f14de782a87532/xuruxolopobu.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/31559567189.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/mivulikagejesupatipesuwu.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/newebisavisozamatozeza.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/4889976769.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/36812553161.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/gepuxaralozoxamaseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=exercice+corrig%C3%A9+moteur+courant+continu+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_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 11088 bytes
SHA-256: 0a3563bd2f17307925fbcff8fe652c3f54edd4b76e4e3fa585d9987a7afa2512
font_01_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 19924 bytes
SHA-256: eea64303b793cb66bd1a03e70fa21559af8a8bd6f021ae7c7706dad57a34890b
font_02_sfnt_off000127e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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