Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8d5bd54ae23d63…

MALICIOUS

PDF

86.1 KB Created: 2021-07-20 02:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9fa6c80b1e73e6a1bdab8df5ed0431eb SHA-1: 647461ee1d0c1d720b0e05f19cfbadd92f9b8502 SHA-256: fe8d5bd54ae23d6344c4fbece43d97493caf147149cd10953aacdbb056d7feb0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness. The document body is unreadable binary data, but the heuristics and URL analysis suggest a link farm designed to lead users to potentially malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://signexpowholesale.com/project-new/christianbook/upload_images/file/53823900505.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9cec27ee---rilogudajimajubizu.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/kaxanijesebuxejizepo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddf5a09f0---jebatike.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5bdb5d54---99122268850.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609272689bbc7---7498315765.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3f1340bd50f211b6016412eca85033b9/toxekafis.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/71441430163.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc8352303d---kubopux.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8169891e9---ravon.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bebbc8aaa---kumidafezosani.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/oi2gufe0a1loeovihjdcdpv2ho/wojajamofuwekujoxux.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b35367192---37468333238.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/39501004351.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/93068702776.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/vuferokudirug.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/gusipofezavaxoxumofowok.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/pibul.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/98928054414.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ou54irst6saekk6dquo44gvg4t/78274338628.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/giborikaganoxuxobama.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099fac301710---67261799627.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1bbb1355ed2878838354905df5c27c2f/korosavozuraforotaba.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/dibikiladasosiw.pdfIn PDF document text
    • https://bem-sa.com/img/file/78358640661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cheat+engine+how+to+use+cheat+tablesPDF 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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 17560 bytes
SHA-256: 8b3f1e9c7d3d844e4411b214f7a052180152fdd640eb5190a0e3687f075a68d5
font_02_sfnt_off0001322e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 10764 bytes
SHA-256: 87d315555a66626752418ad55a49f908d38f2d279bd56d357eb089aebf3d42af

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