Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec87a8fd9c0ebea…

MALICIOUS

PDF

144.0 KB Created: 2021-10-12 21:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7767a4c8d57f4a3316cdbe2db532b3a1 SHA-1: d784618ba40a5e33c4c965b560bf3878d40d3645 SHA-256: 1ec87a8fd9c0ebea41eba2162a5653e2a125e7205518fcd74163307762cca6f3
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The malformed stream length heuristic also points to exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7791

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://nomylo.ru/uplcv?utm_term=adrenaline+dose+in+cpr PDF link annotation
    • https://dakhoathienhoa.net/images/files/beruda.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161382b20153ba---gizabewuvoxatavijixoxupin.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/razoxiwiripusivar.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/nivexowejekujufunave.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/32925812160.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/puvesunepekarogos.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/47617316115.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/3339674799.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23669309121.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/pofisiwinifijepirozas.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/34284700299.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/34253965773.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/4510173711.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161379ae486174---42989484397.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/pobabagoxej.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///83237003988.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/saxabanegifakuma.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/f8f1kl5e238rlp1hk2ne7hvf20/jobufezi.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/saxisetepibogubub.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161432102db087---wagejubexajoboloriwap.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fuparukefupirolijafu.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/15931719278.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/46818938798.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_off00022096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22096 10392 bytes
SHA-256: a9b8d462555899dd3655c5986258014f3535ca31f2221e48211740ff6f452a8a

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