Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60bf503434e768e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 17:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a169245ad26992a477873c137dcb6419 SHA-1: cc63f1b86f55b51659a6eee9711e68652326e905 SHA-256: a60bf503434e768e6f2a48da3aa3038f3ae9ba57f785a5d9f4eed5f1786585bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://esvigo.com/upload/files/xisumazakemuwa.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mjhvjbdg0q7ej68v0b52bhq7ln/nexisarosudunifu.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/tosulogeva.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/28162997665.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f370c16740---temofurat.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/34921619526.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/fejupapilina.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366287ad76b---digibebenabimada.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/8856326413.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/69032000108.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/fazegujulipofajozotet.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/77720893414.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/79207844705.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441d165a5dd---vugovip.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/18789231318.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/8354115463.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/66630654582.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/012038459417.pdfIn PDF document text
    • http://polletnv.be/uploads/files/bosutanuduwewas.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/xukafete.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/8915816685.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9be2fae29ab1c0d197c69f329521c70f/3972912181.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/39587685545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=drastic+ds+downloadPDF 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_off0000b68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68A 16600 bytes
SHA-256: 39829c97b2b4d2bbb46390d125d3bb6e43137500294e2330e74263313d4ab295
font_01_sfnt_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 10320 bytes
SHA-256: 40a944147d65eb542d4a6bbdb899a005c3ca0fa17c295ae26fa7dab99b43e58b
font_02_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1