Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98f2ec95e1a4da9…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 00:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fd1468eadd6bd8d3ccb5ac43eced3098 SHA-1: 3ec169a141c02e42dc0e296af33a05e25be52457 SHA-256: a98f2ec95e1a4da9c57d64fcebfdfd0621b3d3be7b6f381aae25881ea1c81ccd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://ketchas.ru/uplcv?utm_term=save+multiple+documents+as+one+pdf PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bab78e46f60---furobuzisog.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/d69a922cf88b449c6702bf8d230b044d/sabasepuwadoja.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/afeba9f580af64c9b005d2b568e41242/46044625.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a65652dcd56---29845292132.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/poledo.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0dc824df---94050131566.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/300635434803.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/81930082048.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/tazirakujejunalimaza.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a050a70c477---pabobafukosap.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f409f7270b---97433840683.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53459688245.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/14166823510.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/teliwuxefozufoxozilovub.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/89819518723.pdfIn PDF document text
    • http://heureka-cz.eu/files/sudiletugivadugunukagusa.pdfIn PDF document text
    • http://rubensova16.cz/files/file/79887505515.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/zegupifib.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gupebowu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7760dfd9---wugawizisofifapuluwuwel.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/j3m205brois4sfv426bqpev7oo/nuvanezuwufos.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u0a8p61s3lnchpvkfdg9ifi8u5/35666025161.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_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 1696 bytes
SHA-256: 266b75d8d95edd4e06796966e43e1bb0a7116b249193fb313f1988fa9bd38e89
font_01_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 17436 bytes
SHA-256: 882dbcd93b1c35fc1a9c8f2eea8d20862ff1c5cc06556dbf2c7d66628f45976f
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 10924 bytes
SHA-256: 00e907c60bb4f883de70ac79417ba0d9f17ed40ac8d36bedaa2627418ede7e87

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