Malicious PDF — malware analysis report

Static analysis result for SHA-256 08726bf03268f5c3…

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 10:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f5d6842d4d896c8e27bd4491a107048 SHA-1: 7780e96acd0d338f40eca0e489996f1fc1b45189 SHA-256: 08726bf03268f5c31a7cc05bce27935cb627083e91fbbd3d9c099c5021971192
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=requirements+management+a+practice+guide+pdf
    • http://veitali.com/upload/files/nukubotodiz.pdf
    • http://clerus.hu/files/file/39051867550.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ea0b4225163ac370637a84ef60d529ca/badimidulosuso.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/k9eo0fekntbp1lh249f8hm14fv/79728949130.pdf
    • http://kronikarp.pl/ckfinder/userfiles/files/97833501022.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613012926a895---44627426393.pdf
    • https://reniuved.it/file/38628469624.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/63996057812.pdf
    • https://agermag.ro/mm/file/26821526545.pdf
    • http://noospc.ru/SITE/files/editor/file/45643932730.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b9e918441d59c97630579afb454441ca/289524473.pdf
    • http://phuwangnam.com/user_file/file/30285920495.pdf
    • https://successalpha.team/upload/files/neruvobokedi.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ks40221kbv2ntk5uqgn39aivj1/zarapovob.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160723e41b6c44---dokobetesutimavarorix.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/17301341596.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vgp53g9pjd66ubgl4eiuarjs2r/valejuniperobog.pdf
    • http://zrdb-drogbud.pl/Upload/file/88553535864.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4855f368e---14975279643.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b7661c6b1d8---gujikotefidefikuz.pdf
    • http://sunriverps.com/data/editor/file/29231819269.pdf
    • http://pasted-radio.de/web/files/bojiwerujofamaf.pdf
    • http://gfb.it/upload/fck/file/43689094760.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec59.bin
5e934c61ee98567e4fe08cc95d0fa70cc0857ebc0b8bfb5dcf7cf011468ef2ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 11088 bytes
font_01_sfnt_off000105a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 16792 bytes
font_02_sfnt_off00011db5.bin
2f016b3f971b8b787444dde56f073a6c214ef6113cba3dab95015807303b3974
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 19316 bytes