Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35e3191a9f4a21a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 09:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6974e3494a9497c71823e6372da5fe6 SHA-1: 05e07dc90a034de900a905f85ce202b47bbd9cf2 SHA-256: d35e3191a9f4a21af86e5878bb03cf1acc09d5a9936b61a42c844ffab29c3124
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites and disposable domains, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8507

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 https://queure.ru/uplcv?utm_term=download+az+screen+recorder+mod+apk PDF link annotation
    • https://gegeny.hu/uploads/file/kutaweselizorexalusoduj.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161378e6063f76---77545831219.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/25426910587.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/vexebamaxas.pdfIn PDF document text
    • https://strechybenesov.cz/content/nadalukipofavox.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/28791935016.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/67027488107.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2cehk2a3qqok4j5cgpv04uk093/58215645671.pdfIn PDF document text
    • http://annabarons.lv/files/files/82305683506.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dir80scpo561ls4gci7vvqfmm7/10833666343.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/bedimodezarozo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/iuka05to82pdvd8tcifadrcuem/75546359088.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/puvixuzi.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/17766191716.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/begeg.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-8/20210908022625739964.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161356fee306d5---vobobelapesabom.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/zisatolidiget.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/33480498017.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/mililewub.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/pitejinifeju.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/48790083791.pdfIn PDF document text
    • https://viceda.com/userfiles/file/10011521420.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/dumamibi.pdfIn PDF document text
    • 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_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 17664 bytes
SHA-256: 835eefbe8cde3824d2af49cd8a452279e7c1e64fe813b508d10bd561dfdc8ecd