Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d1f3dcaed67cde…

MALICIOUS

PDF

87.5 KB Created: 2021-07-28 05:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c30402bee19134c12d2617e8ba2ac1e0 SHA-1: 6c57fafae4db0945c0630bdc5c07fd45a7b0ac00 SHA-256: c9d1f3dcaed67cde2c21d09f61e9ea08f3b74e6202fdc3652dd95f8120e8efc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bouwservicewinthagen.nl/userfiles/image/file/5869296724.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f503401ac1---29253424555.pdf
    • http://veraschwemmle.de/fckdata/file/tazem.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bct1nsnd809d1nguilr5kqngu6/83629056137.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/93ts4cafa4so2vlk7ugv6kf0ah/buzap.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160833fe920a43---40188890137.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8224f695---69100461405.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741d0b73fa5---zusoretobikomodubamos.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0bba97401---puludagivip.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e352a44761b---7169782766.pdf
    • https://armagedonspedycja.pl/files/file/tekokazed.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/33880160398.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10fbcbf68e---17512011980.pdf
    • http://hanasushi6.com/uploads/files/gojobevinoresij.pdf
    • https://ferado.vn/userfiles/file/varivojorik.pdf
    • https://medtek.vn/storage/file/wubulomuze.pdf
    • http://orlickachata.cz/files/files/rodakaguk.pdf
    • https://rh-h1tapi-turbo.com/contents//files/84582535976.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/3346775128.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/325ad510fbc997ddbcfd32875107c3fc/demodenidizol.pdf
    • https://highrise.pl/file/6249914469.pdf
    • http://emailreceptionist.net/userfiles/file/sobojijatilipulibof.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160702ce9af9cb---2783124909.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+download+apollo+lab+reports
    • 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_off0000f1ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 16792 bytes
font_01_sfnt_off00010a01.bin
fa904c02b7aee9a583fff4a102b451f499de2e06b3fcd3570d889f5d34db66af
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 17452 bytes
font_02_sfnt_off00013790.bin
a681cc006dd4325568aea77f941661bb725e6cff64454597f763afd384805e1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 10508 bytes