Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9eb8d9c17d8e35…

MALICIOUS

PDF

99.6 KB Created: 2021-07-03 19:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95ce495171712a9a13ec784db4f70c08 SHA-1: bc3631b37c4edb98021ece4069facb914c8400f1 SHA-256: da9eb8d9c17d8e35a7532f8dd3f5b957f1fa5a44ffbf7eef34e7120b7b58b122
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097fee3bdecf---xesabizirewubova.pdf
    • http://bryanhigh78.com/clients/72554/File/tulezatesakubabiwutis.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e8601398963d4305f723245748b9d16b/67658167190.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/kadewo.pdf
    • http://pokemom2.com/uploads/files/98434737696.pdf
    • https://adasms.fr/userfiles/file/58693867061.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9e54507cd806ddf8efa6dcce0bb6a5be/19073310940.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/102a32c89c2cc6f0e81b3867df6d1f23/zuden.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6f35b180---89003281773.pdf
    • https://nepalaviationmuseum.com/userfiles/files/16026280623.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d5f55f74eb92551fc776313e2c0e21eb/44860299007.pdf
    • http://thunderstar.cn/userfiles/file/20210503224618728176010.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a527103ce7---kiwatuwapobekefe.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1fd48cj1situcbbmooogfvp2sr/9586884425.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bbd650564---gujubijegateziwu.pdf
    • http://ajivikafinance.com/userfiles/file/lulavibu.pdf
    • http://duepassidalcentro.it/userfiles/files/befapewofuleziresofit.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5b50ec9e20d0350f121ab3e1ca2b58cc/55087310070.pdf
    • https://thefertilizerproductionline.com/d/files/degezox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=grade+10+math+arithmetic+sequence
    • 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_off00011e30.bin
66127691828361a29183ee023d982cbdb6aee9a1e73d3671fc677b560efad2c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 18948 bytes
font_01_sfnt_off0001502d.bin
0045a9cb8c4bc70e82c5100b4a1630cfcda2b052519361a553e5dde59dfc41b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1502D 10928 bytes
font_02_sfnt_off00016930.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16930 16792 bytes