Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c74a53d50ed453…

MALICIOUS

PDF

79.3 KB Created: 2021-08-06 13:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06ccedebca5797fd251d6c43e0640ee5 SHA-1: 3e5bc55b5bddba7bea000af52227857e39138da7 SHA-256: f6c74a53d50ed453da44d42288b3a3b377bb69a00c9e3e8dde352ac1c9407731
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to compromised websites or link farms, suggesting an attempt to redirect users to phishing or malware-hosting sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=%C5%9Firinler+1+film+indir PDF link annotation
    • http://hotelgiottotorino.com/userfiles/files/29241101264.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/3122635191.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/80266982719.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/mugezu.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/moxewaxofatabopozewovutut.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b5818072---26712614148.pdfIn PDF document text
    • http://fteq.ru/files/file/nokafuporomopijuduf.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/sakawagetasifozizeda.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/78482398320.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/xexomezidomagexoz.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/faff5e4591120958981a487451e621bb/39114071766.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/d86q2kaah7srh7o5n1r5c22hkf/giwasidoluxo.pdfIn PDF document text
    • https://zzhqhi.com/d/files/xupelaru.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/wasizevofupa.pdfIn PDF document text
    • http://email-database.info/userfiles/file/97303202066.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/32b901aabd85aa2f20da96dd70295db1/fafusenolakef.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/12855980305.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210724_CB9E465D6183B386.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8454262d1---52050720406.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/81514739474.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/25860388018.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/99847641195.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/892e1893480e0d162d70d9c7c80dee21/71847146401.pdfIn PDF document text
    • https://aghs.in/ckfinder/userfiles/files/ganabudi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7f234099---47569170774.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_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 18096 bytes
SHA-256: 58cb6d062a9c37493fce56aa88fd619aad684b13ed5265c4ceed811948cce127
font_01_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 10172 bytes
SHA-256: 61b69535350757c1c4a14b5c34f784f765ff570ef593ca849346073c5816b6bc

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