Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc196da5ec6b761…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 19:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2241c772fc95e78b86095aef04f72c37 SHA-1: 81cf35934edc9a1c445bd38820bdffaa50cb20f1 SHA-256: dfc196da5ec6b761660b607ebdbca0ce8f00f4fbb5206c6d599c4b551955c3c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting it's used to distribute malicious content or phish users. The presence of numerous external URIs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=lyapunov+stability+pdf PDF link annotation
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf5e4d41d---wunolemenupanukapat.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106070023434197.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff23ded3e2---binuwubelojaluzewivovefu.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/kuliwezefedavegawinuba.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/20e5bffee1148c56f4bf645226a6b706/fisupetob.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/34758894935.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4de9bdc5e3---5928714444.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/28402443801.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/mevilelokikokumubedu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/aad15c2fed04cb8f60f0a3e4c149dd4e/neguwaruzatatopivo.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5809421e440e91c46d8d9c1501296296/gofagonawigok.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a114c7ccbdf---tezebufutomiluzupeluvul.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3252036fb6db98d9bf31cb095e19d2c8/sadapelu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607374a36bf77---tewuzipexeli.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/7911224733.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/779ae1b40e436620d222854612a406ab/dujufalikofodi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072be1f5bf1f---39326973376.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/af4d352990ccae20682963f5d352fc64/rasikolewanewujaruratefi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2i0ed93c56n95isnamsbt0tsi0/17886619232.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff15ebac4d---naxijijo.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/uai179ec2s20gkfqd9q4biln4e/liguve.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/paviwipi.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/47578901739.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884960c1f82---susapopasenawukemofo.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_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 21252 bytes
SHA-256: 3b82ad85b83c1cf2c897a003b6271d84f315a0476e10930e144426efa488f3b5
font_02_sfnt_off000138f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F2 10636 bytes
SHA-256: 2d606845c926a6a26722b1f043ec0770798607566adc742035310929bad28624

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