Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91a5f00cc3fed46…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 15:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5c93250e2f4fb24cd5f595ebbcd10a4 SHA-1: c000d7348abe57b67e9cfccf8b6be0ed79f2cafc SHA-256: b91a5f00cc3fed46f7bb6de82a57fc1eeced3bb17d7d0945d35a2f853239610c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or IP addresses, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144931c33551---domavilubuvos.pdf In PDF document text
    • http://hondaototanan.com/upload/files/3159932376.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/gotosinibetokow.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/56365386918.pdfPDF link annotation
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/pawojaxakusetasedu.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/92086902058.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/85968089989.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/70470096070.pdfIn PDF document text
    • https://aspirans.com/files/file/29644462604.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/jenitavenokotozop.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c98e397137207166a93e237040a82109/gufatabelativejilagaxa.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109050508157875.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/jodegepevuvasenunagive.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/26621775459.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/beririkewarazubalonisaw.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/82317498394.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/rajugute.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc213b0ceb---37548856035.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/bukewirefidixitekip.pdfIn PDF document text
    • http://adveotec.com/img/file/15398060320.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/60578819353.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/wumumivutadivar.pdfIn PDF document text
    • https://lesura.net/userfiles/file/86166648545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+remove+cookies+from+chrome+mobilePDF 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_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 17668 bytes
SHA-256: 9afdb7d9991347ea36b1dad91708a860462d4ede4b82e4b3fca2f2624f25f1ef
font_01_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 10712 bytes
SHA-256: fd40fb307c7e12f91187ffb4ce20fc14f89f421ebd813fb4531b742041b4c1b5

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