Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd77793aa7153a9…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 21:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d66595852961e851fe0d317012db6a47 SHA-1: c33f2c28d912dff569176c1cad8b0be432c03356 SHA-256: dfd77793aa7153a9cd004ac642e4abcbbc5547fea9d5290dc03e0c47d174ba5b
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are identified as link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing trojan. The primary attack pattern involves luring users to external sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://ketex.com/trcgp/ckfinder/userfiles/files/pizenekugafezetilemago.pdf In PDF document text
    • http://abwmechanicsville.com/uploads/files/peselako.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613693208a3df---pexuxeganinirovonupajumu.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/44863201596.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/wumumivutadivar.pdfIn PDF document text
    • http://ledins.lv/cms/file/3129716308.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/tilup.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0642de95---21116104864.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/zolepujegikowow.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/gotaxoviliwawasekek.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/62335029474.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/14652256837.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/getisaguwetazubaluxirux.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161339e0f4477a---63081382966.pdfIn PDF document text
    • http://tzsunup.com/upload/51956696819.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/zefadojoxumor.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/48405175443.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/64981453740.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///lizarofowafaxuvewarigaw.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8b128fb0b498204b80a5360be8d50b9c/76072639644.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/39045189565.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/22423842389.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/35100892382.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/wipiwuvap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fate+extra+ccc+psp+rom+englishPDF 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_off0000b055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC867 15724 bytes
SHA-256: 48a7337d33e923c241c396b2ffee4c98b706583685190abe1e720cfca897535a
font_02_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 10900 bytes
SHA-256: dac1bfab8597fffc900044d82c316e0e3a3de0d504c016ab9a393efd2c20d704