Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca23fcb6ddaa0007…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 16:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55144c7686fad0ab3cf3f55a67ef2953 SHA-1: 4e6e8f2452db7d0f78af9f9cfe5e42da00a0a48f SHA-256: ca23fcb6ddaa0007a41c4e76b08d04d52ef9f3964ea10e62aa43e2f13dfb0104
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nbtele.com/en/cache/fck_files/file/32403151304.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79836c179---nosefojiwoforonalamibole.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/42575935723.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210614075235_pomr6u.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/15726241108.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca9bbc3a4---46909250453.pdfIn PDF document text
    • http://4bx.pl/public/file/25004650612.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/ziribodonewisimumiw.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/827160eae32bee13e6c2cd32d0c895a0/nanunad.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/foxigoxaxabukelozo.pdfIn PDF document text
    • http://asfalon.com/__files/file/boponomojosan.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a4ff27504607c482f773d9ea96e74d09/65080409024.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/90664104822.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051006530625.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161191a4cdcb4d---nutofidibelud.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16116b301a4c24---nopifajat.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/lepolu.pdfIn PDF document text
    • http://erex.hu/upload/file/dimofafu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea5a8821a0---57030250470.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5e4d090f5e24296477479bf0d886ebe6/64100999649.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/59593787257.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/fqds7266bgtcds5thpqnk186ta/filew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=laser+diode+working+principle+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_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10832 bytes
SHA-256: eb78f03c03aea14f5934735e08166a67e64f398b80953919541086f056ef5481
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 16788 bytes
SHA-256: 06500c82bd7e4ae79be12f39693766b0ace9529219f3795b022450193baa91fe

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