Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3bb28f2d186233…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 17:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: adc5a1f0780a6e37e90465dea847b213 SHA-1: 129e92c6707627936763b0617dc4e6ad4d2e05cd SHA-256: 4f3bb28f2d186233f96dd1f8c21633c6dd0f929863bf840c2908aed9a526b232
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many of which point to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://villabrown.it/userfiles/files/44482681220.pdf In PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/tegetorutagur.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/07/file/20210907_123720_110.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7d13f932---67050776607.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/767c1851f630f6b9258e43cc4d55bb2e/telebumete.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qn7r3lth0idmicf37ssouq5rn3/sakumiguvewanufudebelulof.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/robarubaju.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/reseg.pdfIn PDF document text
    • https://ever-progress.com/upload/files/busurewumiwosa.pdfIn PDF document text
    • https://ksuskalology.com/images/file/79146669240.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/lawuxunubakajoxar.pdfIn PDF document text
    • http://partnercable.hu/files/viwozuresakagebivowuji.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6dd2cdc6---95166560456.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/27680831370.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161393243991e1---57034021997.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac23046246---88146475097.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/gopafivemekegigufarojek.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/xasurojamakavibubedimape.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/68936939701.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210901140941.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/85652292016.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/090722289375.pdfIn PDF document text
    • http://4darchitecture.org/img/all/rafiga.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/49386856978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+game+captain+tsubasa+dream+team+mod+apkPDF 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 17728 bytes
SHA-256: 1dbf6d91c93966e29393054457a2022fb0e6450ef9bbcd8be568d32d9e80def7
font_02_sfnt_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 11276 bytes
SHA-256: eb6043f458fbc0b0234e0b5525bb3572b2ce24e84a0836e45e2f664d7237fb5e