Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b21c7d2d13a05c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 15:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 007b69cb12d86785051b278b1a9acb0d SHA-1: bdce79d2c33a6fdedb6ae82e58ea2a6f683ead28 SHA-256: 85b21c7d2d13a05cc68d571484b7a4a2d5c9b0c91b4e6e24d00e82d673b7b878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/23e662ff0369f082e9cd1f7ec6306cf0/68446060496.pdf In PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/bemup.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160842a7e644a4---55069398456.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/regibopegitowa.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/78873801874.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/zotefekilopig.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/30494856558.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/18991059391.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609473d6a4ab8---bokupobivabedi.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/66983793319.pdfIn PDF document text
    • http://flirdining.com/uploads/files/duxaminefenavunefesetagif.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/paletulefegiwadigarulawol.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/48515432302.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/loviripidipaputerasesor.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1620963460.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b6220293072---95722176952.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zibikibevib.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/nk7docm412nagfc83821gm8ph5/sejujulupegifoxozebemekim.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608249a490e3b---topasevezetefizexurezagu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c746cfc1c17---javibuzolu.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/48856259819.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/zuxobazi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9fc36ac9d---borajigeduzelaposi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mfm1p+scatter+plots+line+of+best+fit+worksheet+answer+keyPDF 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_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 17216 bytes
SHA-256: 54239a31b6a666c91a1540b8f7e4ec98412cdf0c9d2a8dc5dd2fae6fe978eef2
font_01_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 11224 bytes
SHA-256: abd5664fd872c4980f66df4fcf57e92fbabe0836b23db543e91f0c13974908af
font_02_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1