Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f27aa4670f235c5…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 12:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18b1605698a38654ecac07f3dab04504 SHA-1: 71d436168206423e8c7a8dcca16e04de67b3afb5 SHA-256: 9f27aa4670f235c5ec8a9751122041296e2b616b3a8631140e0ba65633645e25
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=propofol+and+versed PDF link annotation
    • http://agro-pasz.pl/ckfinder/userfiles/files/87455970624.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/63649909143.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728c144a4de---mugimuba.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a334dc462e---30986775300.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92c3cfb16---24295951939.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16222348516435.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb6e20dd5c---ligekolemajosilivesa.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/1704780942.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/j2mpqn6fhkam71dfel6iic2uab/66227343352.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/belizanovigefa.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/56235198298.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117389875baf---rogulamiza.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/86959784337.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/gizofadaligugonelozu.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/61531118748.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0a1724e00---gawasixogewajower.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/tazome.pdfIn PDF document text
    • http://sdds.be/userfiles/file/gibemogelevezowolewoxef.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081d95fa0cb9---gixixipimibulewenobaruzu.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/wuxumib.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/97018565234.pdfIn PDF document text
    • http://goref.ru/files/file/36465586007.pdfIn PDF document text
    • https://kultmotor.hu/images/files/luzamimopotula.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca6543871---tuwesilumubuluzomaduz.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/jesokatiman.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/n21oog9jo6gvvvvge0ugr4nsit/16726151405.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/kumomito.pdfIn PDF document text
    • https://doi.org/10.4097/In 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_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 10368 bytes
SHA-256: 3489e8e5ab1ec573ec86962dba80b11952865551f0de77bcceaecb0149050787
font_01_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001273e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273E 18116 bytes
SHA-256: 488a8a860e4014e52ec64b3a868609f735e677fc335e5893c96db791de3cbc67