Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a51c801fb13245…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 02:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8c7aa03898a273582a350aafc70a4a7 SHA-1: ab8da9e5b38cfd673a2046bbe5bb2e5508553e7f SHA-256: b9a51c801fb1324503d6157ca41257e49fabde1ab483d46dc3af18e0e8998196
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload directories, suggesting a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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
  • 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://geometrabottero.it/userfiles/files/zovozofajubi.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6339ca7048---wonodesi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b27e0757363---30373153943.pdfIn PDF document text
    • http://hydrem.ru/images/file/mizawo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8367c85a---65034651103.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac4abd43d8---98908322042.pdfIn PDF document text
    • https://digireg.sk/upload/88474374528.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/42425959174.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d47ae3cb---42173588543.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8eebd9c39---80143960103.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f65a6cc33---rarenovetiw.pdfIn PDF document text
    • http://dsagco.com/Upload/file/nuxasikifelix.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/katabotovutatijofavuf.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/nujok.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/46047823237.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/93877385786.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160877ba3e4daf---kebapulupetus.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/mugulusivuzuronuje.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc789ca3bd---zororazen.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/kokujajigefoxere.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0bdacb9bb75fe1cdbcfe2f0d554e0633/32778246988.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/vefupulipazow.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/wewemu.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/dapejubekizadeledidafeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=b+tech+computer+science+books+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC86 17784 bytes
SHA-256: 24f58cb9482f89a4a6c95ab3c4b1555a22168328030affff0dd651ffe98df753
font_01_sfnt_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 11060 bytes
SHA-256: 808a1f7440d3898538c375f9d48383b1b5eccb60d986787808103624673b6640
font_02_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 14980 bytes
SHA-256: 9a04a4e263470254e6461ad6f8b6595c539e411aedec405d8b4ebd1079350cb4

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