Malicious PDF — malware analysis report

Static analysis result for SHA-256 65df50f5d60826f0…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 19:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba2f4f9703ca5b491a0bb5f7b7d7915e SHA-1: edd0f1e06bd0437cf427697716e879d057319e53 SHA-256: 65df50f5d60826f09498ecb48636b9343d6ae2ee79a4e4dfcf94899560a3b787
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable domains, forming a link farm. This suggests an attempt to lure users to malicious content or manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://icltindia.in/userfiles/file/roponufurupupevipa.pdf In PDF document text
    • http://agilesolutions.in/uploads/36393985700.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/fukepi.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210512091405100889339.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/63127264388.pdfIn PDF document text
    • https://stotex.rs/files/51494524127.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/19871504560.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2a5rje9rpi6svo60l8j59tjp6e/nesevuvetegowowu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/afff0693ed6153f021f78db31ca0026c/kagewagego.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b038417c49a5ae6221a8e0371579f3ca/rinimitibedoxited.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/delulijelupi.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/56003180969.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1821d300---27158854644.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1627094614.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/322f8cee701cc7d0b210b084b5c43134/defurezejedimaso.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/jafujasagobu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ffcc1a020fbce1e3f27c9ac2728c17eb/kibuxon.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/22140662816.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d72f2f681---pewepozaku.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/67570852248.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/63622175010.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/54669811034.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3mgrbttpauht88hiqu9k7b4m9a/72325251718.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B5926DCCD62.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=theoretical+foundations+of+computer+science+notes+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_off0000c77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77E 17500 bytes
SHA-256: 99e719126b816a0be4b60fa42b9eb03d59993125f492c2db11803c7b5e6de3a4
font_01_sfnt_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 10948 bytes
SHA-256: 1261263f18a986815110c5f03c473cbcec78bdffa1e8a43c96c51de0dc8d812d
font_02_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1