Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadbc2ef440ba5e5…

MALICIOUS

PDF

75.4 KB Created: 2021-09-11 02:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f33ce5be9801fd79b200332e50c8426 SHA-1: 95da39230a50c67735f465169b29b57f764e5f08 SHA-256: cadbc2ef440ba5e5fb186232be14aa08648cb658a2fd24d86d48c7c0eb5f61d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://nurdagihaber.com/resimler/files/93971941217.pdf In PDF document text
    • https://cliniquemyo.com/userfiles/file/81189667280.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/bexitebafedusum.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/76224922716.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/93852049065.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/77222248267.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/buzadazojiribujowogulanis.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/25300891577.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/58623405369.pdfIn PDF document text
    • https://yellowstonewildlife.com/bubowilupilonowisazoz.pdfIn PDF document text
    • https://robodom.si/files_vsebine/fiwojumo.pdfIn PDF document text
    • http://mobiliteit.nu/files/gijujemeni.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab2f6eecc---kobiresibasuneduke.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/10259863232.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/xejipewuginaporejogup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613691efa064d---22885564435.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/zegifezifu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a221098030---94479650275.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/75540895752.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/zepuda.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/38806155063.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd532c4714---80418190911.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136bec9ca0e6---serudunibexo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377f0e72427---piwizetajumibiduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+save+file+in+internal+storage+androidPDF 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_off0000c1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E7 10672 bytes
SHA-256: fec5a42b8780a06bddaf3ed569ce19dbdc296837ae394d1c133a82e0ca6a140d
font_01_sfnt_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 17488 bytes
SHA-256: 9508ceb54739257445398e0ffc20dda8a0f6d0a8f4fffc14b2e501dcad7c1744
font_02_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1