Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd465e60b6517dd8…

MALICIOUS

PDF

79.9 KB Created: 2021-07-10 00:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 34decf499c43fe37679c54c6644632ae SHA-1: c8e4270b179250e9380c5e2ddc2cc91780bdae19 SHA-256: bd465e60b6517dd8b2e35830434721b0a2dbfc7dc884f23ae88a849e776b1b2f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple URLs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver further malware. The presence of numerous links on potentially compromised infrastructure suggests an attempt to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/490d7a03267afeb924694b1c0081cd57/41023971411.pdf In PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/19eef6ba08e8596e0486c2d4fb848682/21828432940.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc397338b9---93475047517.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/6365233747.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210630005725.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df3412dda4---gisolufeporuwuved.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609486e596c98---95952475101.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1886e2b57---26139503112.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8f7654d65---99131433808.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/n8f3kvd0m156j4vvs65q8ehpak/41686391734.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xafitexafagixat.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50fb4dd58---43737625752.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6afb11d36---galajix.pdfIn PDF document text
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/e648c022e92d33d5d0608ac5005c67bd/fegenimoderegiwefonex.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/37150384793.pdfIn PDF document text
    • https://tckontrola.hr/files/risadifajebejepug.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/gqssqa6up9i244sc77ab27bqah/86800838693.pdfIn PDF document text
    • http://sukhabalka.com/files/file/gupadazeguwa.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/64055809550.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077e9f58adca---rosoju.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/5799579050.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e158b31f79---nasumopegebasudi.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/78736247946.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/09cmgt396cf80it4qt1pa173ca/gudupisapofokig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=script+cover+page+formatPDF 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_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 15984 bytes
SHA-256: 3e5a4ece46bfc60f51de33d24093b6c402778808e7de6c11e4ed11584a2ca97f
font_01_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 10644 bytes
SHA-256: 51fd3ca558c42e13933add8328923ab3a041b97e0a219b0e40fe66ce81b884e2

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