Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f8d112327a4790…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 15:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87d6c47b53dad694474dccee94261090 SHA-1: d5d052e1a8e7346ce2c34b5d89d867b00cf349a4 SHA-256: a7f8d112327a47909ae148c5d686f9055662bca747563f1c5f0d8e0015d074d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The presence of numerous links, many pointing to WordPress upload directories, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e0c96cd851cecb086a01be8c9505139b/57060895574.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f607764d2---39918539537.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/763cd9709b930ceb548f12853da3044e/76213233294.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/gaburipo.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/73220749539.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c1d440c09a37b3e05dcb359c7aaef32a/numojutubijinokek.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a036358e4a4---wufizaluxeweg.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/letekewavafafogigonekafot.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/45466853000.pdfIn PDF document text
    • http://homeopathyhk.com/files/kugitavekamege.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b00f38091---67015243095.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/84544698056.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607585934a153---jepoxadulig.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7c63e07e80c4078efe6a5e7b28b45965/nolup.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/8130003049.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/vowiwewur.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/91449432571.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b902d586873a1b4bb30fdb47b9a0c6f6/50782983981.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/r2mf42khfjlp422j1qjrptq33r/15590898811.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1cqpea745uldmsj5udkq558vso/34959249486.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/zanovilububujatodavi.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/budel.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/43599104408.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/jefibezigakabupajojole.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/35917311698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=current+liabilities+examples+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_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 10912 bytes
SHA-256: f13e40793e3f6ea876841f4630df9efbc7bca6ce9e68e40f9cb47dbd414acff6
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 16060 bytes
SHA-256: dfcd895f3fc3c285bdcf5e81d788af4e1e2d4894f58f0f1432dfed816ed0ab70
font_02_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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