Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5b6c5a144322cc…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 01:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 440c9e500d0dd63d4ce5ad81f374157d SHA-1: af5fd0632b7d2de960d60955fc88fc1c5d1b7a75 SHA-256: 6f5b6c5a144322cc0712da1cd3579497decb013f79d137402bca28efa394320d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The numerous external URIs, many pointing to compromised WordPress uploads, suggest a link farm designed to obscure the ultimate destination, likely a phishing page or malware download server. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=wordly+wise+3000+book+10+lesson+1+pdf PDF link annotation
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c7tr9i9g8m17f1j67dl4pbklh1/tazibe.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3c20643bef036487173a3ff6d633af66/juxanabonevatorisupevoger.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/11788333010.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160982b2ed9648---99296065882.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a1c8d2b1d9f2f1d957d9612d8bc4a94d/ruvozawufinisav.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1b7c443dd---66738285353.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083e89d0dd00---55090385228.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-02/images/files/56655626443.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/66299435110.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f236b222---41109744589.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/21207875004.pdfIn PDF document text
    • http://wohingltd.com/userfiles/pikositevuna.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/71515322779.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b747432585c---jesibigewexuvaroxugeke.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/nowavuzopezejukorejevov.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/10642377783.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/bawikojar.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/31l2os56j1hblv9cgtkc583ma6/4500088704.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/38542409831.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/jukarexulemagidutebaja.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xaraxexefudisigo.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/pevakazoleredupam.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/femeborexupawoxojovifa.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/kitamulogurijuz.pdfIn PDF document text
    • 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_off0000cc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC40 11004 bytes
SHA-256: f905d87af8f60b5e12d4c0e4ff28f11c6e70098a9764b64d1a5302740e8abf48
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 18972 bytes
SHA-256: 67d6375957fb1a252b16692e31b435904ce520e3249ad0e169ebc5ae826c0010
font_02_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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