Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe65249e04c1693…

MALICIOUS

PDF

73.0 KB Created: 2021-09-25 18:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e3ebe83a471f70be8a0660ab71067cd SHA-1: b0b76a1999ac92cfb8b51be88ffde394815b0896 SHA-256: 8fe65249e04c1693626ff8727a6c6bee8b8329794ea9f18ec246a1f6b48b6177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable or compromised domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://domilot.com/uploader/files/46846572536.pdf In PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/93849200112.pdfIn PDF document text
    • http://partnercable.com/files/jisimufadoteles.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/tanobifoguteripa.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68a64bf6f---bozipulaf.pdfIn PDF document text
    • https://thepainter.asia/upload/files/kesajeruj.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/27969251769.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/jexinenokiv.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/19843413479.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/68120504741.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/lofoliloxidemavati.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/23614064928.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/10708112579.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/wilonapexozoxaxejuduwemu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7d89eac9e0632aba81ba3c5c66001ba3/43667489168.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/zekibenupefurexagisebi.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/75474254035.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1cd952150---goxisote.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/54283431287.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/96402419683.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/relapeve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a638eb1a0---93109104023.pdfIn PDF document text
    • https://polytex.de/sites/default/files/5801419074.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/74232592200.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492794dc744---wurosidike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=can+android+devices+get+virusesPDF 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_off0000b7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 17556 bytes
SHA-256: f84f8e45d03d5798f662ba314c96ccc44c08c5997ccb6496ea5929c11cdc3e61
font_02_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 10696 bytes
SHA-256: 6bfa9f7386b7f7e099add16d1b49aafab1aaf658e0d67def723f976b7b7eb432

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