Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02d3963217aca0e…

MALICIOUS

PDF

70.2 KB Created: 2021-09-10 18:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1113d0685f268e0c0f88d6885778c11 SHA-1: 841353af8e75073443fe7a4bf8d71f9ca716f70a SHA-256: a02d3963217aca0eef04e5c3c870496e0eac2242e09972f8286f054482b3cc13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites, which are designed as a link farm. One prominent URL, 'https://drafthe.ru/uplcv?utm_term=chromecast+for+windows+download', suggests a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=chromecast+for+windows+download PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd290e687---65805656403.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/bivofikinejarot.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090421035173499.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7d4c9760025ea0b82c0eb7dc07c99ca1/34024826197.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/zoxibolim.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/60551486744.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906222118.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/juvapevigavimi.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/34164411342.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/40040248030.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/somanodujogivedilovasax.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/lokiga.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/78731299859.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16134272a1cc24---gaxega.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c73bc03d5---pidojetapasubexuteka.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/rexin.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210906150939.pdfIn PDF document text
    • http://unibox.lv/files/text/borejawoji.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613180cddb8af---94121885944.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/tisozaxepuzadabumejilo.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/kuwisozivari.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/48356903976.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/277ccd1fa542cb0277aba8d3e4cb1abe/dupanasesoxexe.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/xenogotel.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_off0000b3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A8 15316 bytes
SHA-256: f827275126970c7de64ce29d8dae122b7e9bb0302afdd99c7151b333a5135d00
font_01_sfnt_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 10860 bytes
SHA-256: 8f86a46c18ba5e56a2e7e052824c8a79a889404a6631300eb51485bc079f0397

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