Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e16741ef2952bd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 11:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60b164057bfc4580df4324b9ffb745f2 SHA-1: 2d2d961152d929c91fc9265d6a01e275788c7da0 SHA-256: 35e16741ef2952bdccf0d00a5e3f9b053a16e94e2010af0f7fe0f2f4647ed92d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://chcial.ru/uplcv?utm_term=ticwatch+e+wear+os+update PDF link annotation
    • https://kaptenhoki.com/contents/files/82275000474.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/67222358891.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/wonuropevivozobab.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161380cf3c52ab---22140382492.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/kodazifuromevujenujabix.pdfIn PDF document text
    • http://nature-revive.org/files/file/98356891650.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/mexeg.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/34944206030.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a790354244---43258911107.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109010716177211.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/90801128010.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/mepefoka.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/lugopoxezebixusoj.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/32449821152.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/lowisupisejara.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/93408981154.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/mirimunafowutavopolije.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/20939368410.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/58027939411.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161418f2adf290---57807526218.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/pevakaked.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/pelebofidigavisotevego.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/xufimerimovufenufi.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/basisunemilufewete.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/50435896404.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_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 19264 bytes
SHA-256: a20942d658f5ef94d86be6388ea685f35b31d3f40aaaec613f7548c436a64caa
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 10612 bytes
SHA-256: 6be75a318ac78ee4977186d789016b073ef2ed876d0d0f5a22c6d2df9238c3cb
font_02_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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