Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c329c062afa2d22…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 08:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd3ec5a1b424dd1224dd59222a208850 SHA-1: b79929a302f92a5475468398a0fe2d607b91ba9b SHA-256: 4c329c062afa2d221ce9bd710c78502c37d991e29ec4fe75dc54bdd1fa63dd36
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites, likely intended to redirect the user to a malicious payload or phishing site. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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 http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/386v1s4npctmvkrh6581t41qm6/79299813749.pdf In PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fbd4a1babd49bf7a6dde7e117d54abc7/21929008840.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/fupisilewosumujas.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/nbdiap236pa9fafhgkvrd0fbf5/84934455721.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/31424939977.pdfIn PDF document text
    • http://esteel.my/userfiles/file/besuzutasoberojukekopul.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172582752804.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/vg4hnvgahheo6dtl6tf0pvq0us/xizereziguz.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/kexiruxufogosowibok.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a529d9de991---64231491825.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16120514ce222a---59887565046.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/a800eb75bbd4f92588a28274bf170457/99889753279.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pinolesamijizafarejep.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/votobovirupapefinabutiwe.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/fasudovumoredezujofi.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/vopogumo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e457e09cebadcb396a261709650a47ae/bagetiza.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/lubamovijejovilo.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/75134185400.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/58974650982.pdfIn PDF document text
    • http://inncredel.com/uploads/tigebunenosulig.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/712484572.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4b4e622804e7b47a37ac41a4db49a491/zuleseduleniwexisixati.pdfIn PDF document text
    • https://renetravel.ro/images/files/44330823267.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/74848593367.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tp5an79bik1rs9n14s0drg23mg/42272456459.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/2b8690e4ff28770fa16a60b88653ba92/gaxolorojoxe.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/268acd2616bed7b828f97e0669aa443d/jigufiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=algebra+1+polynomial+word+problems+worksheetPDF 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 19368 bytes
SHA-256: 33e389f32d18d2544f07d5e6149876408739f2aa573f6d812ac99637d357cf59
font_01_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 11304 bytes
SHA-256: d58267c41929cd8a21ca15b1e6ff444c2ecaa7bf8151a24b458107fce87c0192
font_02_sfnt_off00012420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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