Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd7ebe1889657c4…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 23:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 256b7b82a5b68f67b1855f8a429cc04e SHA-1: 121a43801e4d4d84604778f02f276a43df7e1ad1 SHA-256: 3dd7ebe1889657c404dc3abfb09bf0eb9f84eb610525f2751d59659f75d06a6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=the+selected+disk+is+of+the+mbr+partition+style PDF link annotation
    • http://uticachemical.com/files/upload/files/nikov.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/bowuk.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210912093621.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/xoduka.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/68563891869.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-17/20210917060224536541.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/fatugifede.pdfIn PDF document text
    • https://norservis.com/files/files/69936437337.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/73c39608b228c2e93da05ea9ab9618b1/9803683981.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/30370694699.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/6934115770.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/306b61a833f9e5be7d848e884a5bd8c9/46385308949.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/mebaganutelopa.pdfIn PDF document text
    • http://savemaxint.com/files/file/dixuzapixeboxuwe.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/neromoxelirovuxenugex.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c75e5899d---43542468720.pdfIn PDF document text
    • https://birotex.rs/images/files/riguratida.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141983c29c4c---raxukosutaju.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tovevezelitazafif.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/afd9d378ed7e07e15975b85433bb47fb/40998709264.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/vominogoraxu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e3398578aac01b0b0cd8c2e75f711b4e/24145919458.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/79046925520.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/zadapesexeberovokowaxizuf.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_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 11192 bytes
SHA-256: b2f64519ddbf1cf5064ec9096c20ade50cabfa3a719978dc30752eb41cf7a35a
font_01_sfnt_off0000d00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 16124 bytes
SHA-256: 757416d71d0379f498470cca743409965d2811c578f91678f7a50f9bce995c7d
font_02_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.