Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb68ba598c7ad6a5…

MALICIOUS

PDF

71.1 KB Created: 2021-09-23 12:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d116bdf3fbddc7e1768dd85e6d8310d5 SHA-1: 62051638cc5ee10a19cc0ad715238baaf12e2d37 SHA-256: bb68ba598c7ad6a573d61f8c2ac129cab54c6a99c8513b68fc8c139895f9d713
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to manipulate search engine rankings or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=what+is+the+command+to+make+it+rain+in+minecraft PDF link annotation
    • http://netflor.pl/upload/File/livotofebatasej.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/dekowijufabamosasub.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109021855326279.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/86531363740.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/jefadimozorupowuk.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96228218515.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/49060608558.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/zisewajabonobuwaf.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9f5bc357---kezojenoduxafuk.pdfIn PDF document text
    • http://domplus.su/userfiles/files/78025671363.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210918080749.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410da6d5349---tazuv.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091308070269.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210905_B2B35B5945A5C20D.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/pekoxakozafud.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/e4c3aka7r1bkn9mtk5t4ue0u16/56716599374.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/mevideb.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/mozisaperugojibesifi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6c17041ee---86582952709.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/momerakapopesurasovud.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/98235573112.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc5e15cc4e---20690471585.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/20756332041.pdfIn PDF document text
    • 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_off0000b2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD9 16540 bytes
SHA-256: d6b0ef1ecf15628ae74d52d173e694d3fea73d2a496845d5fc5e86d910037709
font_02_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 10780 bytes
SHA-256: be65c58102e3cf324e315586340a69666302f6a8f3af7ea0df14d73ed481c3f7