Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e181ee0dda6e1a6…

MALICIOUS

PDF

84.8 KB Created: 2021-10-05 17:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5793c4c3c635d0aa9c628ffb679946b6 SHA-1: cac51bb73a54db34d6da25070d6db631b56f5b68 SHA-256: 2e181ee0dda6e1a6c30aa65a21c50ec9da2002276d0d2c7a7d1c9eb3c1c06853
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to lead users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggest this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.humillacionyestrella.org/ckfinder/userfiles/files/zagunalemobelajofebejina.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/aa9367fdf1333d846f708e3aff4b477f/lavomedokeminisid.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/67140881652.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/57871111574.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/87241321564.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/rumusaxinebeviditedomi.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/vejige.pdfIn PDF document text
    • https://digireg.nz/upload/23058713797.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/77298662686.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/kerujudodo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/86961875909.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/45095912178.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/22322e1530f8ff0d2314d4895d6a22c7/purigivigutiravobokevo.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/zutid.pdfIn PDF document text
    • https://rcot.org/userfiles/file/88590953239.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ca05a2320e889219e22b9c92a2b39dc/63788003980.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/pikutedevazuton.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/65712683168.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/97334227725.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3d19388a---66374313886.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/molili.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e79ae5f27e---xodakanutijolazubo.pdfIn PDF document text
    • http://happy-land.hu/editor_up/31805159297.pdfIn PDF document text
    • https://sealskinz.ru/files/file/pimosejetodoza.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/98208193473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=emergency+watershed+protection+programPDF 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_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 19284 bytes
SHA-256: cde0a26d58d19872ace283e99db015b19d9c10026849103ad9214eff3a987507
font_02_sfnt_off00012b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8E 11096 bytes
SHA-256: ce20aadafa52b80731d5ce99e62150c8326b17a8c93bdefb2bcfc233d1594b15