Malicious PDF — malware analysis report

Static analysis result for SHA-256 239e3e6e222317c8…

MALICIOUS

PDF

69.4 KB Created: 2021-09-05 04:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c970a5d3120f342b85a1db7586850a8c SHA-1: e4fcfa897500d6fd0425addd81c8d8549296d3df SHA-256: 239e3e6e222317c8efe488aab0809bd4b45b96e3f6cf5e20c49d14a5f09288b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and embedded URLs.

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 http://czdashan.cn/uploadfile/file/2021051401474773499.pdf In PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/bc0210307da488d7f60efeaae8f6bfa4/88733465346.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/7154198598.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a051491767---danad.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6102E3887EB5A.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/54653482770.pdfIn PDF document text
    • https://limsurempat.com/contents/files/31325972942.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f17a7be513---taforenetudatimeviwurorok.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/17980710669.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/cq2knua6trerv0aq4lvpq258vq/xukakisatikubenixe.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/wizovuvitumab.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/fibalufab.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bd4a1c6a3---pajavajiz.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/lotibiv.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/punosawomamijipeboxel.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/vusirovokokikawugo.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/94843781274.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zifuwadolofutegup.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/38dg4f5nmpcn2rdqgra985qaiv/29538076513.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/9354357464.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/82604252948.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160869c59acfa3---99158587102.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fdf6c2eff---34006548397.pdfIn PDF document text
    • https://esz.jp/img/editor/files/91652839508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pages+to+pdf+iphonePDF 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_off0000b225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB225 10632 bytes
SHA-256: 5460768eece8eabceb07ea2564ebc1bc573e6c1dc8f7474e474a6143930873b6
font_01_sfnt_off0000ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA31 15304 bytes
SHA-256: 907859e8e9eb3b120ab1b4a8316186505d712cc5671699c9f00b0e6678fa34b9
font_02_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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