Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb6e87034fc74ed…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 04:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c489fd486fb35a362f87b0761821bda SHA-1: 6d535ad677a5e5aadde88d1498a5df6bce9c607f SHA-256: cbb6e87034fc74ed5a7fc2ec807c75b63112ef6909a55f44ba3ac0008c73117a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://orikon.net/Images_upload/files/zuxiludige.pdf In PDF document text
    • https://venusnvs.com/userfiles/file/23420807568.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e349b99e9647bad5c32494c9d07364ea/51986362631.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/11610333870.pdfIn PDF document text
    • https://nada70.org/userfiles/file/nizazazuzekazogadewaw.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/luzotasu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/6e4ed7ee41b1d1205f0d0695c584c847/zabarepojereji.pdfIn PDF document text
    • http://vit-physio.de/file/vozinozuv.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc640f31640---36659545028.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e04e1521f62---67773093989.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072040771c0e---xamonegobalidofep.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4ooc4r6r81h2bb3guu72ovcvku/wuxato.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/em06ihk6hd1qti7g8kp9be8qc2/laloraxurajuguvede.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef00d8b56f---83033518193.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b21dc3eec---37289408566.pdfIn PDF document text
    • https://makenie.com/upload/files/suredubo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaf2a4aea3---1931336669.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/fogaduxagujololexigil.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/vojuduxit.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/16300552193.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/zemelobopobigid.pdfIn PDF document text
    • https://europartner2.pl/uploads/puwevukadaminojafuk.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c867c20f---13130610848.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/82085502906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ziarat+e+warisa+pdf+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 18836 bytes
SHA-256: 4369c006d27f3b5e2b2f9b6d57304c4ef5b04a43710242306fa54d269fb83db2
font_01_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 10268 bytes
SHA-256: 84a689e2a48349bff79890b46f96b0afa486ace7aa60458a4c1e3a925202afab
font_02_sfnt_off00012f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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