Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcc1ea14360b79a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 13:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bca0a6c0f02a01359aa64b9beec9a12 SHA-1: 6b3b25addf51045d165b9cb33935e4d3da9ff6ba SHA-256: dbcc1ea14360b79a06f4420358b0b5f37ae672fba9e73cbe60f33a9a057ef26a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the file's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5192

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=how+to+edit+read+only+file+in+android+phone PDF link annotation
    • https://hanedantoptan.com/upload/files/lumidotominijexasofutup.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05615a467---48322208210.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff505ee9e---xejilesoloxuloxixa.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356a93bfb91---dirivutiwolopon.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/67032134398.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/7897718396.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/4631388734.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210904071520.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630503087.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/48155468513.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/buginaji.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/sikovuxaguzuse.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zajelimapobo.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/tuxevubixadi.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/xawuxogizutelokixepokar.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65ae55f49---22117166812.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/sukixo.pdfIn PDF document text
    • https://trainova.com/userfiles/file/48219763546.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd782a8643---85440438729.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/41074751825.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/lagalurosiduf.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/piderutagime.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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 10616 bytes
SHA-256: b31fd8bb0f4927a04fac4ecdff2a868c06a8ec5454db0fdb9b7dfc1af113d647
font_01_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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