Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d55ef3400e509e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-26 00:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c387d0c23906e0dc32ea670170ef3e5f SHA-1: ae7c1465456544061574157aac0f8d36b439f5b6 SHA-256: 42d55ef3400e509eb34bc746e330c7e1ffa9b0c9f5681d0ad2102bbf46319ce4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs that form a link farm, a common tactic for directing users to malicious sites. Heuristics indicate these links point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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=widget+firefox+android PDF link annotation
    • http://turatabor.hu/media/49487066236.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/56433394717.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/kedibupupilojokojas.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/56064209479.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/ditobajudas.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/wewipowuxuke.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/denusugo.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/vonexufuxumazoliroreruger.pdfIn PDF document text
    • http://master-br.ru/img/file/gexekozodurixiwodiras.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/jewifejuw.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/675bbfcd8d4836df0f40dd9072f59813/41888531590.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/61468668688.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05fa7e647---jupelajegalikivobazigezo.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/68320289942.pdfIn PDF document text
    • http://opsir.eu/files/file/mavesudemomojedanibadi.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/wososigelakoratesipow.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/6587669079.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/29585475684.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210911_235557_5316.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161345adebbe75---jetanejigogig.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/jopibuten.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/92227174513.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zokug.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae917180a7---47914546059.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/funitajalefudedesuw.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/44531519191.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jefazejabaxil.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_off0000ba85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 10412 bytes
SHA-256: be9609ede6a47dc3110b827bb88c9d2ebf8ae2ca0f4f3faa95bc4cc0a7374359
font_02_sfnt_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 17580 bytes
SHA-256: 619840933215563b8edf366e0b350f48a8d027e539b877370815af3c9a07f2a2

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