Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39b851039371131…

MALICIOUS

PDF

72.9 KB Created: 2021-06-09 04:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 74fc6d10d9fac52cc2b98bb4f3ae6c5d SHA-1: c924c26e21673632f1b41468e0063d868808e591 SHA-256: d39b85103937113158cdc8fffb2807366424dc4a0bd610370ca5b20fb797faca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting itself as a source for free crochet patterns to entice users to click on numerous embedded URLs. These URLs likely lead to phishing sites or further malware downloads, exploiting the user's interest in the lure content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=free+teddy+bear+crochet+patterns+free PDF link annotation
    • http://recrute.fr/files/files/vajodivusiketep.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033aa91b52---44104220065.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076f03831683---22257065344.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c836e498e226053cb624ee5346ad7f30/82819606661.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b889fce8---59318124482.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a66049e09a4---15004037075.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/3affb8d17dec20119bc2134003eba58e/badefezodanemoles.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/zufizumute.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a700136b---guxilixigevotugilotaxunu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sezasazasil.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6b6af215---89115126265.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/vatikuvezafepurazepofibi.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vapet.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d1c8d22b---tonuxakame.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a24dd7f89---jonisi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/n9aqkj5ccv0qjqdgvau0djof45/gugekuge.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/m9ddtbi0euihqgdmhqd3slp7a6/54618784587.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 5408 bytes
SHA-256: 9f85c23322c64c52ad38ce5b57d9f8a94cab23be8ba0183076f51b3e1b520ba2
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10828 bytes
SHA-256: e1b5354ee837b9df9ba0f441965b47b67345044f9883db4d6a5788958f70fae3