Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b5f79bd86fead3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-22 14:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38349be92b5d2c386d3eaa65fa5e32e7 SHA-1: 9b6a4d2494b7a8840f9d1fa6d14e1b267a15b829 SHA-256: b8b5f79bd86fead3d6af0c9dbf5cbbc86fbcede67a411bdc77a8c4d320fd800f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which are likely compromised or disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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://aluminiosarla.com/userfiles_arla/files/paniwovimazelugar.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614615e325eaa---72165291053.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/nexalatulirufusosuje.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210914_B7D49E82FA420F4D.pdfIn PDF document text
    • http://na3.it/misc/file/85364097927.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/12406082348.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/30965580681.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/gitepobutixerowi.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109020437558617.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/xelefufibugipawowavoxabur.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/kkij65fqt27h68ak273hl2d7e5/96603374676.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210909200251.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/54840816825.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/58583294865.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109101732243892.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e4d345927ccbef761fb294117b8a231a/wuropifufewagumoxowop.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/kovorejuvijukulavor.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/donafefezuru.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/gikugokimedomov.pdfIn PDF document text
    • https://fq.ua/images/file/24420920347.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/53741683068.pdfIn PDF document text
    • https://viceda.com/userfiles/file/kejoronope.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/juromarax.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/42814075217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=create+pdf+from+images+in+androidPDF link annotation
    • 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_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 17844 bytes
SHA-256: 53fa813c0e53a4e3da0a1e4a5f57053ef44ace85256ef7517caefffc306a8b96
font_01_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10828 bytes
SHA-256: 87a76cdb0be2d1a87b5b33f494b19ab322a8737ff1e7eb4a35ce6069ca1028b3

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