Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0663091fa740406…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 17:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b745e3690d63733cdae2dac47b70877 SHA-1: e8984cf08b9e7d3ce461bd52d8a23afce5d0c87b SHA-256: d0663091fa740406b034f94f53471880bc9d86a6f0024ef77afab4188edcdcdb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c7947986---gumabetujudowabeduliwez.pdf In PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/bevojicd44c3d3ito6vfmeh1s1/navat.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891dd7cd6d6---25407644586.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/3094141263.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/732a7873b99423fa72922816c65fd8d6/karaminufufezakogupite.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/89135696342.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/41335125482.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifelijivixarojajegagi.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083376b88ab7---sigajolasopajet.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4ab454db6d337f70f214627e5d114d8e/57992157130.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870dc761a82---ritupigiwevamuto.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f70eef1a874---fonalidurenawomoxevasila.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4bc3lmse3msabhdtsh1i9h4f6f/lokuxerujujekaleke.pdfIn PDF document text
    • https://memoservicesrl.it/file/mutomevevebezaxugupa.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/winunumoketopexe.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/nobovivozebupevi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qbf2b9t20po1hi4nqilvvqe1m1/22299987417.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507035632208908.pdfIn PDF document text
    • http://www.77ice.com/upload/files/fidizemotaweluxavan.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/xopenawegigawera.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab29989fc13---92710574792.pdfIn PDF document text
    • https://hirurgija.me//files/sumepituwisogasikatobad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=referencias+bibliograficas+abnt+pdfPDF 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_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 19456 bytes
SHA-256: 8f67bc250677ea47e1e5d6b41fb63dcabe00a7249044ab3320e302b8ac104484
font_01_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B73 10980 bytes
SHA-256: 8f86ddcae3e1f377ef27448ae395c0c67931f357a18ca068cd07aa8f973a144a

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