Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab85a9971a0d7dce…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 07:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f85f58998de116f21157a402a475e9a1 SHA-1: e3179348a5361fd46c005a2d27f0cf5a10c6db4f SHA-256: ab85a9971a0d7dce3dafc6dc244372f5640a08649cd8885d00c603227c632904
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to malicious content, likely leveraging embedded JavaScript or PDF features to facilitate this redirection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4060

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 http://kimura-shihoshoshi.com/userfiles/file/semebotokolikumabe.pdf In PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/sokekatalumosowu.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/ditowuxizituwototigafi.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/83379810767.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/lobenapenonumen.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/bamanunibetadagigeputiri.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/6862233254.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/50329045747.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/31474892136.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuxakawer.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/9019931957.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/vonatedazepur.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908225456.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/26183532760.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631164744.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/masodut.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/71a22r4mfbahlkgqjb5e2e7238/83868585126.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/94999778166.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe02811b6f---sedidusubiveb.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/34116359682.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/20770200412.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613361e1457db---zedakesuto.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/xirobifagekivufigibarut.pdfIn PDF document text
    • http://brlairport.com/images/file/4803649806.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/33455519041.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/34198100002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=animator%27s+survival+kit+pdf+free+downloadPDF link annotation
    • 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_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 17652 bytes
SHA-256: 1014f0fbfc624bf5bd5f4d1f082b0447b67c454015eee7a35bad246eb1ccc8d9
font_01_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 11016 bytes
SHA-256: 005a395d859b8eef30f747d6316944630921c69d4e415f60415fe6d7d160d550
font_02_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1