Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e6280e93e94dcd…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 15:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 630e937cbce78f46472bd95f11ffa26d SHA-1: d71df60eb50156d6693d6fa883bf8048bec8474b SHA-256: b8e6280e93e94dcdec038bac953181584ae1c3e6be44aac97ac7df3ba5fa2d7c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. The embedded URLs are designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/cde8e2ec548ecad1d4f42198b06bb294/xubinexagesikepek.pdf In PDF document text
    • https://torgradio.ru/new/files/file/2045347055.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22ec5ed1b5---94834701386.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/mowogitapumebedase.pdfIn PDF document text
    • https://music-group-store.com/upload/files/wesafigofavobelesefop.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/xikuwudedazenaxowaxerudik.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba8d5e492---44116372537.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d962d00f280---46846364647.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b26a2e24---12213757456.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f352e8ff---77647518252.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/wemotipewiv.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e6a6f4ea340c50d65814cc829b8788e7/makilogagegibituganig.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/natikokipumed.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/35388364559.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2747199787---87817954406.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b498ca3db---44481455651.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/61728014438.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/xinozanamutitokax.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/78dd5cbe3d92365a3eaf650a585a2502/93444283345.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/47361965680.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/solagetorufosumevebazagu.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/61672916008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=spatial+reference+systemPDF 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_off0000d0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FA 17572 bytes
SHA-256: fce123ac98bf1cc906c2a9b90761cc19a0df29f525c5deaa71b6dff259f7f30a
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 10712 bytes
SHA-256: 4fc734b881593ff7446e985b7d9bc2db67713738a17531a4aea11d4c916babf7

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