Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef3aac95772e26a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-12 21:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9245453430b773fc206a1f46687ac38d SHA-1: 87acf74072d67b3bd3da68be1e0f1b996c9e0779 SHA-256: 9ef3aac95772e26a7507b78af27aeed888d2faa18dc9b1b6e73a63827de1b82f
154 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The presence of multiple PDF link farm indicators suggests a deliberate attempt to obscure the final destination or distribute content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6966

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 https://adsbudget.net/userfiles/file/87684432321.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0alu7gvv593p6jphfl715ru2m1/97614737376.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/nosewigozali.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381d99b39f4---nupejepawakobir.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/73346606469.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/lagavu.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/zuzasozanogovini.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/vodesexegopotawuvusut.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/zufenopematafoka.pdfIn PDF document text
    • https://blogsma.com/files/xenutibenuzitalevoduw.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/23769116397.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/18410572343.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/vosisukodeva.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/lanuzaw.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0a13ad5dfe4e2c7bb91271e5a26aeaee/vewegoxofagatolato.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/regiregusetexataro.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/96554367837.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/14954631939.pdfIn PDF document text
    • http://ossokahve.com/upload/file/ruvumemibifa.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/09ffa2683c12a5c64f025e3faf19954b/43241918163.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/70837497998.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/32873835179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=xvideostudio+video+editor+appsPDF 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_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 17872 bytes
SHA-256: cc300e5c51df2643cc255cc9a201bf231205c189d9f2c64ec1484d7f96e3ed74

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