Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca543dbe3ff1e5f4…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 01:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53286d07c818e1081b56a882280f4df1 SHA-1: 4cd6e1c611e33dc7455cd2c220acab8ff12f6650 SHA-256: ca543dbe3ff1e5f4e492c658d8114599a1b42278e517bc0f7a1cd555db89449d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or redirection scheme. The presence of these links indicates an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3c520f77---peweborazebedagorazofof.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e12cb4f5c---72122796221.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/pebarunesemima.pdf
    • https://numen-wow.com/userfiles/cloud//files/vekekefepopopifun.pdf
    • https://plasy.com/uploads/file/74102243675.pdf
    • http://aldara-latinoamerica.com/userfiles/file/24303344564.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d58c98356---87203401457.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f937d16a22---42752477227.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/93954648579.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ddecbd7eeaef07c9008c5c471aca1e2/nipuwi.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a961d0471b5---39521473442.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/92f1ef75e749e8e32a8745b90e1c0c33/rimalivisuvuvezawonelobap.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b171c780e---nujoxawegasadanokugafu.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/59231406308.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3cbrqb8nio3bfn0p2n0kuh4u12/13242881055.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2c174afcce0c79d3b98925bb784939ac/dedajagexabu.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/nhd15us505pltt75salrfitasp/89833543335.pdf
    • http://europavloeren.nl/siteimages/file/67788720335.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160db921f94784---pebasizazeva.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/dlutib658amigitrr4eqrgfi30/36808039403.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a9545708160---5922350467.pdf
    • http://daimarconstrucciones.com/images/admin/file/4206732107.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=10+examples+of+pure+substance
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8e.bin
2bc63e460d101af21cb7b81659872dbd63559bb62c42d746ab771294c048072a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 16776 bytes
font_01_sfnt_off000105db.bin
c0508518d1114ae4a5b7a031d54a298b05b6030b29199c40bdeb1a56dacd2892
pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 10968 bytes
font_02_sfnt_off00011f22.bin
205a82feabe0d241a8dff9343c0e3dc9c054a57a6953a707af0c47b1cbaf1515
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 16832 bytes
font_03_sfnt_off00013702.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13702 16792 bytes