Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d9f51cdf259a60…

MALICIOUS

PDF

68.1 KB Created: 2021-05-17 04:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ef40ead09ba57636e00f65ae1f3c20f SHA-1: 3603b7535fb7d3b0181ef1a74d2179a929f276cc SHA-256: d2d9f51cdf259a608f344cdc8afa8a93d26146d48a09af257957848009e27dcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607556477c50d---65302836094.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809b74039e4---joxafulafose.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b60648161987b0d579e7575b355118fe/57945733104.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/78221555477.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a9657e67---latos.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f938d129b0---bapuvi.pdf
    • http://aggengr.com/uploads/CMS/file/votibibili.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fe1823c1---93842129408.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b923190a58b1c9c2112fcea86c1f113e/80341361888.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/krhp3gdo9g201lqcrcvrkbdmtb/wiludidesidepomakulasi.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160889c295e5ab---solofoporuvubu.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0978744e0639cadfae466ce6280ff1e1/sofofedokikil.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a04352391e---torefoveteriroxawipe.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7f522bf199f3f61a6b5333ab2d29f6a0/jamosebuwu.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1fbba2e5---dikagobilimixa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=apple+developer+ios+human+interface+guidelines
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce89.bin
20c6c2520175c95192ffaf411111a78bbbdcb85a80d40a8a2d2b4d9bf7937bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE89 5620 bytes
font_01_sfnt_off0000e184.bin
072d88275e9530c7ce5d8596435f7905ecca560be39b670b9e3478cb73b542b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 9864 bytes

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