Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fabf3f2e388aa2…

MALICIOUS

PDF

94.4 KB Created: 2021-06-28 08:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37fa4be7a8b1b4fe28efe44c82528a21 SHA-1: 828e8c80af5ec6870470298cb51647440956cc44 SHA-256: 84fabf3f2e388aa2686fc07d0770d7eaca2ad42afb9330526fd8206d9baaebc3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pbchistoryonline.org/uploads/file/38675820649.pdf
    • http://skiflogistics.ru/userfiles/file/29948796346.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d56a96040fb---mimotajugod.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7b4lnhm4assa3tpfub617g3vrr/pinifofopovuwajoxu.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/e5k4r6lt5ugeap31gtab4jbl5r/7715008124.pdf
    • http://x-site.by/upload/editor/files/wujujuvadab.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c5288ee818e60f51b832fc949d4b0740/35846699176.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/jhna0gfal02uf5tqgg34f0bk5c/27679356418.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/edc79a53c3c9a86bbdcabc23bb09d8e7/79040210830.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16095393157440---domofobasovi.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609984da6eec7---65508167404.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/nowaz.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e725f9eb3d---suzivewela.pdf
    • http://kompletucetnictvi.cz/files/file/xanenoki.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f5e679d13e46f0f74d5380a2793851cd/14744712566.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/texes.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160781ce11fe7f---rasudupulamiwetunemomo.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609841755fc92---65632613855.pdf
    • https://its-bulgaria.bg/files/file/bemivaradigiro.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e2600709---45576423544.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/tutebukorene.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/50ef8392e7qt46pl7ugjh4cbo1/dipuvim.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/sepufozewos.pdf
    • https://alnahamgroup.com/userfiles/file/litifunesiwuxixonew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=oir+test+questions+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d16.bin
d5c461838ea16e4ebef2334c2c9f568c16dd851c6b26f6e837651c10506d0971
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 10516 bytes
font_01_sfnt_off00012519.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 16792 bytes
font_02_sfnt_off00013d2b.bin
f394195f0ef02b3f957a4a808ab1972eef5ff43a0307b6f58728bd030e5dcbca
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2B 17948 bytes