Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e7b83be54e1b37…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 00:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 34c482bc57468bc8fb3e8a0e1cba0e3d SHA-1: ab9ec8f316429e98dd5a5ea1155e53c63cad4d29 SHA-256: 46e7b83be54e1b37ba30d9cac3bd6dc95cf189d06056d02d526d3e7bfacade4a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious links. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://capmar.eu/userfiles/file/puvubusodozebi.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8564b3939---temesukoxil.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c321aeff2---25979985846.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/8159602409.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb706262dc---jofaxobisirunowubezo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b947eee2---buzuwagudavadakuxi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5aa7149a98a8d0326fa5ba82ba893ca6/lasonojizexepojepil.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3261073a3---80784547985.pdfIn PDF document text
    • https://orangerun.re/photo/files/44348529675.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/puzubakererujew.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/12120677225.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/lrakp6rc66tr92ehgom6s62ln5/52586791782.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/60e0e05821f92f4f32e3de14fca1c063/17375722814.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/cjha9p2hhg2p01osev8fcfq1j1/xowubajumevaxupifupozas.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16086f3ff9eb56---zowigefexixo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/85b70563332f04ea6fcd6e48a30a2ad0/tukotesuse.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b891a39ed24---dexusijagigutoja.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a119aa29651---potogolubexuguzov.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/edbd6fef71e42778a009a7ecaa24f977/gobaranekazejijafikidijo.pdfIn PDF document text
    • https://schmitz.cz/res/file/18493172045.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b2236a7d---71721037794.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/79942752485.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/db3be75756769fb304c33cd8cd5e8162/16459922695.pdfIn PDF document text
    • https://2acontractor.it/images/file/vigifi.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/45651016151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+say+seal+in+spanishPDF 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_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 10440 bytes
SHA-256: 87c078719b259bacfd7de85322a062b73b51b1355207c107e745a62ccd1c9a8c
font_02_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 17172 bytes
SHA-256: 80f7f9eeff6e00d5200bd8358dd7d006656ec7916770563b3d4c59e209f27d3e

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