Malicious PDF — malware analysis report

Static analysis result for SHA-256 a074f901d026270c…

MALICIOUS

PDF

63.7 KB Created: 2021-09-30 15:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7eec3d1c3092ff081082588938ae64d9 SHA-1: 13cdbf314ae020bd166f24e61b612721da4e86e2 SHA-256: a074f901d026270cf8879e44dede7b9dded6cd4ccac383a45968cfd0aac9ef5b
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised or disposable domains, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier further indicate malicious intent. The document body is unreadable, but the heuristics and URLs strongly suggest a link farm used for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

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 http://nhuaduongnhapkhauaz.com/upload/files/pukobij.pdf In PDF document text
    • http://www.themixchange.com/userfiles/files/xeravagupuzepopewoxuxodob.pdfIn PDF document text
    • http://inistor.com/ufiles/files/3975180680.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/kojozugarapuzonalafi.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/tulutopogu.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/lobemegajujipiragel.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/fatalapenedoj.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614d178f1cd2d---viset.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/80039335317.pdfIn PDF document text
    • https://codecs.ro/images/file/kenokozatawowopad.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/48526956345.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3llk46gj247vqlu8iuch372jse/wiweregeve.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/bogejizikijakeleze.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/pasunatojuwu.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/50523049579.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e04d96418a29334289595a9ca87b60db/18571006219.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a048e1115d---nibofolonodogexitazi.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/mojovikumabifomiwiwuzata.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/jusokaxosisabojozefo.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109172316316274.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135426bba827---19054152770.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155a1b13ea99---lixaxoveguwiruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+hls+player+githubPDF link annotation
    • 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_off0000ae9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9E 14892 bytes
SHA-256: dcbf57c1626ec11d66e464e5309ec09c67c535e5a8a48c2dc58bab00ae4b6970
font_01_sfnt_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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