Malicious PDF — malware analysis report

Static analysis result for SHA-256 d253ec987ddf8cbb…

MALICIOUS

PDF

95.4 KB Created: 2021-07-03 02:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bdaa166b7305fed4f1eaca5be97a2a8c SHA-1: d89c9c2ffdb68022f21d3ea62ba15f894fb3550f SHA-256: d253ec987ddf8cbbcb34a1dc0cbaa0e1a2742e99a6c31d3ec002fb5dea110a5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS upload links points to a common tactic for distributing malicious payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://wastran.ru/uplcv?utm_term=watershed+management+ppt PDF link annotation
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/0e8e4e35785257d7ec59012f45255c10/60847683139.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/654v82nfikcf3saak4u6jjbeuq/70726397892.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1e5f50c17a24ba364343af6f013b3be6/xemanevugusejox.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be671572e8f---fajozarerobipizeta.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/zaborujo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/17bc59dd9c0e7ee9bb75f4d625a16723/81490918997.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qmaerdo7rciknfipmt908am1p4/4207799451.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/31746570249.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/sanuposoxurogumavoja.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8c2c4c88e---mulinijuxewulijawi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd8b67e17f---ritelojewa.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/61005148223.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ceb0e3fecf71cd89a93cf9e02e2032c5/jajalajititumevisumo.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/47217720549.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/jofobaz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16076de0a8e9fc---11809393590.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/99254684d3f994d96db9413f0fa28444/gemezomaruwewo.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/5983170335.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xupovaz.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sixubiz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k8vuifana57rovu9571g5e67j3/luvatu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/kdihpit2jhi8ijm8a42f7vgred/59585332968.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/eq3ubkua2ihcfl49pe7dfc8712/35517325369.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/fozofuki.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 10576 bytes
SHA-256: f66bf7279e0de5e9316f1405e05f9ce285018f6783a481f7a46381e01c394f30
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 16380 bytes
SHA-256: 2f0f2b2eb8adfd382bd5595154112d9a96155f591f04685a5888fae58ac66125
font_02_sfnt_off000128c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000140d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D2 17404 bytes
SHA-256: d4158757eac20b0a1fc8b9b3b9cfdf11a0fc2c6608366bfac605be6a3f580e88

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