Malicious PDF — malware analysis report

Static analysis result for SHA-256 8293bd0ee3fef4d9…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 02:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bed698d59b8d9226fb8e74ec0426f7c6 SHA-1: 18cb9329addd9a3637477ec12844b7d2a1a79535 SHA-256: 8293bd0ee3fef4d9c543b9025c157654ad59db34256a09c48d39fb6d5953232c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. These links are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hyundaidongdo3s.com/images/files/42645656255.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/91ab72dcfbf90b24b6c7bef795b89954/85415338178.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/vinazisuvuvem.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/lekezezofafanowadogokaxej.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/zetotajulagotavawuzep.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16081871b360c6---39150786837.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/pokewifatow.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/kixade.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/68413067509.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8ab8d2c516ed6edfbc6547a8a6663ab2/navuvokekaralafiritaguvet.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6ad5234d9---53175186565.pdfIn PDF document text
    • http://www.bash.cl/media/file/82106093791.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/basotu.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/97916800851.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/34336516774.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49f80dcd6---vurepagefuzigifimelemev.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/637b48ce05956ed86dd160068df157da/buzekekekokipotawexum.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68a6b6f86c---bomawuwaludotupipob.pdfIn PDF document text
    • https://egca.fr/userfiles/file/57149594189.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/94300030341.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b425ab0a6a952fec4e2436a514bb5b9a/tobopepusopedetesoxise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=interior+design+elements+and+principles+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_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 16720 bytes
SHA-256: 8fa96adca13499715c2c9cfe196375b5be737d6d8c4b77b2e8aea78122a94613
font_01_sfnt_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115ED 10916 bytes
SHA-256: 0d1da1cd57bcd1fdd6823afdb70e8c65ae1326cc502cb45ee58cd1508aff2d5a

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