Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9ab7f5f15f7990…

MALICIOUS

PDF

79.3 KB Created: 2021-10-14 07:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aa8456b2a97a0397f527db871aead39f SHA-1: f2f1463b88a790c1a14acf2031f957657981edae SHA-256: cf9ab7f5f15f7990cc3a8ee584c5fb3f46111a555e3ce2f76149e6e9f3c6970f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS uploads and disposable domains. These links are likely intended to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.valathors.com/ckfinder/userfiles/files/33492451067.pdf In PDF document text
    • https://larioenergy.net/uploads/file/nidemikivoxiviludamo.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/68146676423.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/9544439965.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/19934700473.pdfIn PDF document text
    • https://mkontroll.hu/File/29026639819.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/xiretokejedinev.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/q04lp009jjfunl0l4tqj6ebs7h/62227431385.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/xobamokowamoduniguxo.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/viporan.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/17268410431.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20211006172533520.pdfIn PDF document text
    • http://gibisch.com/files/files/19694863767.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1168604936612f906de390a.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4c97f8e4---kader.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/76354125166.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161614e8bb3a65---55611247541.pdfIn PDF document text
    • https://dutchhaves.com/uploads/files/202110011452097457.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/69178123111.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/61005054144.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/2795949187.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/witewolotezisebone.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/gilolotuwetubesodebufa.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/81759339920.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161669cbb6cbdc---99588909990.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/53615448372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/6Zflnl449io/uplcv?utm_term=12th+chemistry+one+word+questions+and+answersPDF link annotation
    • 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_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 20328 bytes
SHA-256: 6060508a12416c88ea250605a9e30025c70c66a73dcf411d8a5330e56336c621
font_02_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 11112 bytes
SHA-256: 4cbc86ac620d427f8d7546ca300b911b4476efb8cf3a8c18d8daa036f7cbe910