Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdd641af0af99f4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 02:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc9d4ccffa7e70c3c87bed99a45d3e4f SHA-1: 4885cd78bf39d14f01b392b66150e6ce00704ea9 SHA-256: acdd641af0af99f421fbd9e7fa76a75921a750e322fb719cbd059870ae52581c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/437a5a444707a5fec106098c6da568ee/fexovigemogibuf.pdf In PDF document text
    • http://budaors.varosom.hu/userfiles/files/dipanufuxo.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/julupitexobetaje.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16149052188326---modine.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/64392155033.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/nobozaw.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/tazojovawifoxowolop.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7f07949f83bc52d39936cfcdfaf4428/46394600566.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/zoguzemudotu.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/30705658294.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/zafawugezumo.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/jebemiputewij.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/30207630641.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/sizukuxetovuwibodapap.pdfIn PDF document text
    • https://cardolf.ro/files/33962585126.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/53528590781.pdfIn PDF document text
    • http://cochemical.com/upload/files/zenuxujaze.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/zavekofoguposixabezajijo.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/wusanos.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/75211382803.pdfIn PDF document text
    • https://longhungphat.org/Images_upload/files/68958191874.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/lukesogigexejuniv.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/35856331213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+best+of+running+manPDF 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_off0000b21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 17340 bytes
SHA-256: d3b37ab48c70598f74e0fd1eea7d8070656649901054a5f227676f64052c2245
font_02_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 10816 bytes
SHA-256: 97f1bf4b06f42f89bcf39f278f303b2c01beafe6cea9d6b8cd97f770ae46238c

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