Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c19e0dc59d0297…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 15:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0183b5dd760ad2264f1a584d3a1a9de5 SHA-1: d3059362cfefd7d156c7c2dde553ba6b6816d0a4 SHA-256: 65c19e0dc59d02974de7379c37c546803084acd60e62164e83bf8fa64c356af3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate a link farm designed to obscure the true destination, and a high-confidence ML classifier and ClamAV detection confirm its malicious nature. The primary function appears to be directing users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6426

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://15881588.com/ckupload/files/gawoz.pdf In PDF document text
    • http://momsystem.ru/public/file/52658928076.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///migavamalilavikuvenu.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/79097120678.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/42991912937.pdfIn PDF document text
    • http://askort.pl/Upload/file/bisefikurasepikupupug.pdfIn PDF document text
    • http://cabini.it/userfiles/files/35260807629.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/nghmi8j7vkljii84d36rcvi5s0/golupepewamosujiw.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5030caa0ff0ec7942e2acee064a73f9f/55482523600.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e866445824---62804159976.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/13803014308.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e7938f5ca8e---bawodomafaguwifij.pdfIn PDF document text
    • http://sksound.com/userfiles/file/10984534347.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b42ba233468efa6c3f1359d00600890c/42753966550.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/33893888406.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/lexanu.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/64027480614.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161206622a9aeb---93428985678.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9792d40f17---fatufuzejoz.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qvr8j4htam5ajc78g2quhon4l4/totugudibolas.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773bc44b061---82979906351.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/13267063992.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/birujamelelubanabijefipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=a+grief+observed+cs+lewis+pdf+downloadPDF link annotation
    • 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_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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