Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ac4664ac9e06d9…

MALICIOUS

PDF

96.4 KB Created: 2021-07-24 12:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3fbb43aa488256e38d5beacfd426ca5 SHA-1: 09c003a5965b27d2d491aee78eb872f5aba42778 SHA-256: 01ac4664ac9e06d9278f0f271ba4ad4db3fe95a36f6eaf96798c60f5ff7fef76
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into downloading further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://poketomecam.com/uploads/files/vavixiwiwilovosunoxexo.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b602cc2a510d08d2bf75bbb78e78f25e/64039329022.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/gjqirnakm5lbjrqjnc9b7afmq7/kufiwixovuzoru.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7e436fab22d44281415fbdceaa90283a/jemilupemis.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216201138219823.pdfIn PDF document text
    • http://canoeing.by/pics/files/20237220010.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/20713504142.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/1736792819.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c36ac2def68---59532230380.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/miwubukosikinore.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/78674183372.pdfIn PDF document text
    • http://contelex.it/userfiles/files/telizitedixodafeguta.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/22720179312.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/43445973876.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0b5815a2884b2493e8861c52594a4c9c/92261139428.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2f91f841---41306772808.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081648def728---30185359377.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/duwevumerexadowedivaka.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1b16816351af0ea487850cf97c851efa/demof.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d7990609214f88ab6ef969e948a5c7a6/fobub.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/65423298869.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16245413272608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tout+ce+qu%27il+voudra+tome+2+pdfPDF 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_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 20396 bytes
SHA-256: 498e5f84ff0dd1b6af64b3826e14426b7f32fb117620d89f7bcc0d1f957e3332
font_01_sfnt_off000140d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158EB 10940 bytes
SHA-256: e848a949af1f5624bf20bbc5ee656b80ce54ce3d44319a05a9d1248e7e76557b

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