Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7937dd5bdd0efe7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 11:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8cd4cfeb361b747ef72b3d7271400565 SHA-1: 1e878e13df527dde3de78df00b1c28e0cdcc68a4 SHA-256: f7937dd5bdd0efe7177d515cc0e333e087594135e88be82a7be6614198402bea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to deliver a malicious payload. The heuristic firings indicate the document is designed to exploit vulnerabilities and lure users via deceptive links, potentially related to phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chungangroup.com/uploads/files/202109082224163845.pdf In PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/87598935043.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/90226705316.pdfIn PDF document text
    • https://empresa-venta.hr/files/37226428134.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/36240712096.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/gikadov.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/89366828628.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141233e80fea---vizufepef.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109042303518433.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/kuwazijaxojamukujix.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/sizixajasojagulutamafi.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/tekimi.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/guxolesewosedef.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50b7eab18---logaxajabepigirixirer.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/lofenafuratokedet.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/bukedike.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/rikizito.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/dexuzoxabuvijagigaf.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9c406f00---jiwebibi.pdfIn PDF document text
    • http://nature-revive.org/files/file/natejirusanemani.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630548942.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee1c168747---nupomu.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210911051034.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9fh6paikjidqk4usc37bk7n0g3/zowumefebitadusol.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/tavatufofanet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+update+crashingPDF 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_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 10828 bytes
SHA-256: ea3b7c024cb987016c95aae143e369125f89696583e2781a48f8c0b078cbed8d
font_01_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 18056 bytes
SHA-256: 3b8f3c88b37481dfceb8bdf1af20ce0af5ff0cbe9c32dd28dfc70bfdf0e2aef6
font_02_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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