Malicious PDF — malware analysis report

Static analysis result for SHA-256 68435015e1950e29…

MALICIOUS

PDF

77.6 KB Created: 2021-08-20 09:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f0b267aaa678d21cf70039b75eb9d2c SHA-1: c4ea82b372fa5c61193e56248f4de8a8909dab98 SHA-256: 68435015e1950e29e8d4652dbae1ba0ce3cb42f93afc6b0316c7320dd14a6cea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6553

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://cl-pub.com/files/files/81316073840.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85dd2507d2---85490432471.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611e487b11006---janega.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/saxukogifokekukawo.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/wafur.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/29502783104.pdfIn PDF document text
    • http://sdds.be/userfiles/file/bugasoxagedizotukojir.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c530c6b3bdb---17544454113.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1aef966f4---34914008643.pdfIn PDF document text
    • https://lesura.net/userfiles/file/7025161553.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/futojupezegevewon.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/12501474324.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befa927743e---96563014306.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/8246212623.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/16432253771.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f344b62880f---31073916795.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/57242619675.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5774ca6cb---17419475854.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/eedsibiiu391kqa6efn6oavdqt/welukefexumikot.pdfIn PDF document text
    • http://digifast.cz/userfiles/2162437541.pdfIn PDF document text
    • https://people11people.com/uploads/File/lisabiluzunisukinil.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c17b0c0fd04e86839ead6f85c65515a6/8705171706.pdfIn PDF document text
    • https://sy-tech.eu/file/39332770880.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/47147173484.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0787a0f3103490621303eed4118b3bbb/mimigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=8th+grade+science+reading+comprehension+worksheets+pdfPDF 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_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 11312 bytes
SHA-256: 6dd21840791c5c4b5320e85bd910eb23334da1f3566e19453e3b860a7afeca69
font_01_sfnt_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1