Malicious PDF — malware analysis report

Static analysis result for SHA-256 d910da4a3fa35cce…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 16:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fff46bed0796ecf913aa3d43c2663bf8 SHA-1: 31b74365fbec5127243cc6e863acffb6a06bd6b0 SHA-256: d910da4a3fa35cce5f5e96b52d677d9da0492ea18e0fb79274aa0cfc7a43b4cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://progettogeometra.it/userfiles/files/18430084709.pdf In PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c0e238e84---misem.pdfIn PDF document text
    • https://fiordipannacremeria.it/file/12268730633.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/44252365286059142b9e77a2fdd5b762/mozutipewigifofomerewez.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5q4u5ah9ogpc4v0lfbmb0b54gv/22973239957.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/fulajijowanovirufis.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/zawik.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108080004028641.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6bd866be3---60947208436.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d61d3e798bd---gazapudedarora.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a716d0e5e---zuwulogapuzuzoneruzabu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dufujapobibaturebejod.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cd22e84b669---wetowidujavonapek.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qg73oj6v7gnijcj7mp1labr103/44871341619.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rroejlo0t8m0d4lp3mgtbh2mt7/jenidejetirosol.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/80489142592.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1rse2h37c5iek5u6fupcsde6r1/bikawisoroz.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/8083212616.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/8646946904.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/kereloxovezefowuk.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/rilabijafemininew.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/40050125707.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c793265d80c---12181418400.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/witagukuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=set+off+and+carry+forward+of+losses+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_off0000bccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCC 10796 bytes
SHA-256: c798f8f001172985f995f9cf6f8eb893cc9fd13208695645d044e41bbdddb56b
font_01_sfnt_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 15676 bytes
SHA-256: c635c58ec9ff27b273e3790c29a4696b68640ba879fcafce0c6538bdfac2c77e
font_02_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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