Malicious PDF — malware analysis report

Static analysis result for SHA-256 567941537daf1ece…

MALICIOUS

PDF

64.0 KB Created: 2021-08-23 09:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 051cc9da846aa9868bd4c605c99632bd SHA-1: a4786b03bdff17e78ab98fd05c8063f9016b407c SHA-256: 567941537daf1ece76b5ea53b3c9a2183e542e8f67dfa75dd79f6aa89a2489f0
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9596

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=mc+commander+sims+4+download PDF link annotation
    • https://igruppe.no/ckfinder/userfiles//files/kuwex.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/19965782588.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/luvejuvalediwufidi.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wekesumix.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/28533231615.pdfIn PDF document text
    • http://fructusartis.com/i/File/rewobo.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/acf8dbc15f9c22b519974c067bf950e9/42136527189.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/besasuveguxezojoxavaparil.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/i1re2g4p9p9co2mcb1cajm4iij/fidakofifabu.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/debewiruzajafikunufifal.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/lojurezesibebawigejesavap.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/ropelupaxaje.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffac991fc9---nozomijebukelepe.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160746de406bed---948062480.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/zokujuvoliwerus.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707fcb809a---58424912723.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a0777b8d6925553f19ffe9438c073c75/70309789657.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/13075126684.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/duxelizubidaxu.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/61266065936.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd1420371---51693905599.pdfIn PDF document text
    • 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_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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