Malicious PDF — malware analysis report

Static analysis result for SHA-256 194c64ea7d8e7cd6…

MALICIOUS

PDF

64.0 KB Created: 2021-09-17 22:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9220be13df308185fdbe9b47411fda1c SHA-1: a37cbd6d9896bebc7e124e936660052b15b2ec32 SHA-256: 194c64ea7d8e7cd60099f40dd888e0a5ef0cc0b3e5bfb88369eb3168a4861a81
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7086

Heuristics 5

  • 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
  • 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://palenice.net/obrazky_clanky/file/vikubediroxobab.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/58ab8b4be20183c03abec6250aca44d8/89008535574.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/30791766861.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/89461331070.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/48634721133.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/67015387770.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/40334704764.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/86548282621.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/ruzanuf.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/1679343532.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/xewowasazakeradiba.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/dibunorivimukadelifob.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138082bbbf1f---73953194862.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/29605951337.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/32213288712.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/48747892100.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/lugafadojopabovewafigakur.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/xirumoseludaxinewow.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/75604558524.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/jatemusemevugiderewoki.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8f2467bcc620c83aa74c27870888fade/43910326134.pdfIn PDF document text
    • https://renteci.com/imagens/file/jivej.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/lizogogozukit.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143107d8c139---ziluvifa.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/8046575349.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/pefugo.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/gejagozebolidasolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+sync+iphone+to+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD83 10756 bytes
SHA-256: 8c606069aec4f8f21d4809190bce659d7c5d8c26c1aef9f93e4e36a6737e38b2

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