Malicious PDF — malware analysis report

Static analysis result for SHA-256 340d743e5c84f4c6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 02:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: add703368019f809886fba11f4b3b796 SHA-1: 85f059418768b660f9decdcfc0dd2ae28ee3dfe4 SHA-256: 340d743e5c84f4c621b1a1a87b5906af5525c97c1e15977a2ccb945b917f81cb
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution, by luring users to external sites. The presence of a 'download' button lure further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=watch+shutter+island+online+free+full+movie+123movies PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613808ba9604c---luxukozuli.pdfIn PDF document text
    • http://erpos.sk/data/files/86186297945.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/81504363137.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/rokivikotetarudili.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091619161673499.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/mozekavaxupagalejesijikix.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tuvesoluzozagexifumirem.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210911_995D85D6C9C4E62E.pdfIn PDF document text
    • https://servauto.fr/img/user/file/fokef.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/521201671.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/valuxago.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/86754039814.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/50701555882.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402e2bcaf74---33914776832.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/loluveneb.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/wurunilokexugifozukojod.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/kusojasago.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0ab875b7---94385716089.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/95633273624.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/kepolafu.pdfIn PDF document text
    • http://labotinnghia.com/img/files/78998975012.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/65722923936.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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 18484 bytes
SHA-256: 7dfe5f847f6f0e90317edf37657f12a5810646cc09f16f10704c08952c855f07
font_02_sfnt_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 11244 bytes
SHA-256: 3f9affa72036ce08ef01f4599d906e795f66a863fe8d6073cb524fececf866bd

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