Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0450e3c4890723…

MALICIOUS

PDF

60.9 KB Created: 2021-09-27 18:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aca26db88cdd19a0d1f1a9e50c7ce7d5 SHA-1: d5e3b7bec799678c1a950f1959c928848d031f90 SHA-256: bb0450e3c48907235292234850cebc87e1d83a4884db7a027aa881b085e473fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised. The presence of 'utm_term' parameters suggests a phishing or spam campaign aimed at directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6429

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=minecraft+premium+account+dispenser PDF link annotation
    • http://ymjgolf.com/file_media/file_image/file/96238094320.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/84998587405.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/52622757148.pdfIn PDF document text
    • http://exosushi.com/uploads/files/96527499086.pdfIn PDF document text
    • http://jsdarvin.com/files/24990999484.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/1188843507.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/13689132635.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa433ae422---12524653742.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/88511674061.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/40598147167.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/69289798597.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614e13f6e05e5---rirav.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135492e48274---86972205149.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/60698451777.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/68021335648.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/99566621770.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/600124732.pdfIn PDF document text
    • https://kristinanamaste.eu/files/31485766454.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/lajagam.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460d7bb22dd---pawobarekitudatowipudi.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/72460265206.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/39885631746.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/78ab02362fc21631a0d2bbe588cb874e/wimawamebatisipim.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE79 10828 bytes
SHA-256: 7364f9d8d675ee2a19bf91ef657c12e7edd348e1d73b4e55a98c7b6e530d359c
font_01_sfnt_off0000c76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76D 15664 bytes
SHA-256: f1586b43e6e3b37915e4099cbdeb9a4de28a54b2e9bc0b3fd740c8758f3c418b

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