Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1904ea162e9011c…

MALICIOUS

PDF

92.6 KB Created: 2021-09-08 15:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d7a98bb174aaeb8693c41dfab5df163 SHA-1: ff786a98e24f7f2b78a2e0e1d69c5ee651f940fe SHA-256: f1904ea162e9011cd4f0a5f4585d58338ff465cc55d09a8f77af5ea5b6291aa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=kubera+mantra+kannada+pdf PDF link annotation
    • http://detaycopymatbaa.com/userfiles/file/waveziwadexesu.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/17477487363.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/37008073852.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/61388259560.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/63ecf5f0f18fee970271a88daf943bac/foxikutogawitakafeduja.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed0a73820---velukuvusoz.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/xanokuxomex.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zaxajisijipeme.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/famapipilatasofufim.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/86083765793.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/kisitojesijigekozow.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/35116541615.pdfIn PDF document text
    • http://chpcentre.com/files/file/doragumekudi.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wupagevebotugazoxazat.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/wevidamizutukadosil.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/58768166779.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/78587677846.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/27531698048.pdfIn PDF document text
    • https://deepex.hu/hirek/files/48788629647.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613462343c544---50770643767.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/72538225449.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/27350018093.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/gabigoditifadukelolamifiv.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/30192294917.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_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 21004 bytes
SHA-256: 25a39d80c53e1ffd3e2f3822484123177a36d06f936e4f0ee9cc36f6709b7064
font_01_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCA 10556 bytes
SHA-256: 0a1715b5b11009f7e589248f36188a7a2e2221766eca0f5c0623bd6a6f99afef

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