Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4ffe8281779cee…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 23:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eadbfb6693e6e2fc5ecc44488f70d7ae SHA-1: 334d603ac1cff967fc20dc8750b4eb7101536212 SHA-256: eb4ffe8281779cee8ee436b351116089b756a1529149e3a80812af3b8ed4f5d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://appli-veolia.net/ckfinder/userfiles/files/11474568410.pdf In PDF document text
    • http://syntra.pl/userfiles/file/8510132394.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/gewegozibefunilu.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/7200262443.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/raxiki.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/43423149135.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/sowalegiziraserim.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/rujoxabike.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce5166d3a---maguxefabepufoxas.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/52269726101.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/dizibefozuritelev.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/50166877274.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/wukuwixenusubop.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/tavabutefavugut.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109091002557580.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/98592368455.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f24872ce---87135833720.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/2670953950.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/vawadujazibofo.pdfIn PDF document text
    • http://keramann.ru/uploads/files/mekazoverunaniwekof.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/79201028462.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/k1l5n7i1uuen2f33fuia69eg02/fupovesubomuj.pdfIn PDF document text
    • http://elskenecologie.nl/files/bufem.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/tidurusukebikekiz.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/2531585892.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/nilegetezogigejujelaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+turn+off+the+vibration+when+typingPDF 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_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 10920 bytes
SHA-256: 8ca7c46009cafb7f3b17f29c51c127edbe5513fef8276149689ad3fe9773abff
font_01_sfnt_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 18100 bytes
SHA-256: fea0e68414383166251fed519648913a10bfbe66bc5f06cb41a2e3bd1d841c3d
font_02_sfnt_off00011d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1