Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c866044be81dac3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 02:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 078cbe88fd88f130439f35199c5c1445 SHA-1: c5c5204a74566398d21ad3e7de113fc01d08bdd9 SHA-256: 3c866044be81dac3db06c4ef9995653abc4ec28aa9025865fb005e86f2590ad0
162 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to potentially compromised or disposable hosting. The heuristics suggest the PDF acts as a link farm, likely to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5559

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=duke+nukem+ps1+manual PDF link annotation
    • http://tc-antey.ru/uploads/files/50132591168.pdfIn PDF document text
    • http://championsview.net/userimages/266312857.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/95064607186.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/lesugelosiwotobagamiwe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9403e515---vawovikoregakemoze.pdfIn PDF document text
    • http://msiutilities.biz/documents/48859876756.pdfIn PDF document text
    • http://yuhongzg.com/d/files/7757910006.pdfIn PDF document text
    • http://mp-journal.com/media/file/27738417768.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b064c1e27d2---89623544030.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8njfb5mdiqtbiljsls88muhpa4/remadikonu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e6740dfc5---20852539963.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/57195339703.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/sifijafosoxuxave.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/32942565470.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/17806331708.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/1926683553.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/cbb3e4608dcb5f2d954efb4152e7d70f/jifinebukuxa.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f43e6a8976---71153141143.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vejawi.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/27543566276.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/t2ktdtm5hb6iujtg6iatj46g5p/fagakinitaterimupevefab.pdfIn PDF document text
    • http://ctm.it/userfiles/file/wixeganik.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/7277524362.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a81352e3---busumirudopiragax.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_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 16664 bytes
SHA-256: 047a9ab1159cf157c16e272235ba03d06377d8efc6f58ac791e6320a4414d99c