Malicious PDF — malware analysis report

Static analysis result for SHA-256 6125b7e4a3d215a5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 09:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e43274346e941bba5fe6c49882a47b2 SHA-1: 0e00ef157fd3034a657ac69417e72ce447004289 SHA-256: 6125b7e4a3d215a5461ad1dbfbf055b131ca741cedda1cbac8dc02c8d03bf75b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pernambucoimortal.com/imagens/files/zezipivibo.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbba207c4b---gotomejidofebotopujelida.pdfIn PDF document text
    • https://finliz.lt/i/File/wosipoxusini.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131241f82e85---68487513870.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/89583461268.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/poxiditupija.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219141224207639.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/63823d4abf0b4742911c938daee60fa1/91271180846.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/17539946198.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210915_F916064C68D124EB.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/bosare.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137a04d7ff7a---fisuxudovibenovinewutelik.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c8757fab862791ee70d25431995f9ecd/molij.pdfIn PDF document text
    • https://kawanmto.net/contents/files/rizikisuzideporodel.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/fafav.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/10554309738.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/47673352245.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/61978565082.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/68015044613.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/wolozagomugow.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a1a010905---73619062105.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/vulegofiruvebudik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=video+videoder+downloader+apkPDF link annotation
    • 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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 10332 bytes
SHA-256: a6010f4f0aef3a0d85260d9819221523c3218cd503855fbb2d4f287b47435e4c
font_01_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 17272 bytes
SHA-256: 7401e1dfb00bb97785470ff62d010b72b0c5d8784542bd0e28d6715d2fb3fe3f
font_02_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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