Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ae03ad22f92b08…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 13:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9b3536eb124e088659c4557905823a8c SHA-1: 58db5cf40d16b39b0dca1c0c471e87161d8e1b54 SHA-256: f8ae03ad22f92b08dc536565ec8626222ce1b8d9dfde7101203c2b1e2ceaac5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161443a4d25a82---90021270492.pdf In PDF document text
    • http://xycrusher.com/d/files/9662628737.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/1317838852.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/zijoze.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16149828f6708a---89250204488.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/19691647919.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/22742528485.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613507012f5b3---vibogujedabetuwiti.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/30925798168.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/tujiju.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/feradiridaninilesawulupum.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/kametiwupurudo.pdfIn PDF document text
    • https://cronos.jptecnicascr.com/yiicms/ckfinder/userfiles/files/dalejo.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/musisuxitezegewabobatuxob.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/26185393812.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9196babba0e42d030a0ab7f853b72afa/ragokorozoriraxekofanisu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155705f07ca0---vipegikezeril.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/52540773522.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/15809229421.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/resewovadevuji.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/diliki.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/pujiletopobabi.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/11438261584.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/83013322379.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/23049888668.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/rumani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=free+internet+downloader+for+pcPDF 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_off0000b3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 10508 bytes
SHA-256: 8b283a5c9ea6ba903948793072d8af248e7cf28c8350f6fe00ea6e9728dcabe9
font_02_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 17248 bytes
SHA-256: b568dce7e423f56ae2e878d087482406affe75c1cd5282e5a50c403879b4b021

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