Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86d9e69dc9380f7…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 13:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 062c7376a0d454da202ddbb18f83ea3c SHA-1: 6a431ef118940fc27f7ec3317a58a7e97280a51a SHA-256: b86d9e69dc9380f777152cf33996d10e6a7c0bcd2bf5c7b02da371ca196a6d68
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to other PDF files hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the structure of the PDF and the nature of the URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://berettyotv.hu/userfiles/files/39661464125.pdf In PDF document text
    • http://www.terresdescaraibes.fr/file/34729203177.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/bizifum.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9f06b2c3348d1a3e5bb912297c64ba33/25797421823.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/12326569328.pdfIn PDF document text
    • http://mweb.cz/images/file/bevanuta.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/27089217606.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/nanabikozesosiniwuwigara.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f98573071312565c094d108bce2796b3/wedokevavijak.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/purafep.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/94715574211.pdfIn PDF document text
    • http://axwelindia.com/uploads/21339622022.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/betusuwikenimowerel.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/49610064054.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/dulefiwokimibasejati.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/dodofusutafiw.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/98890247041.pdfIn PDF document text
    • https://rjpexport.com/files/rizisutaxejuwomimep.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138e400a27a1---89693548930.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/jemadopixudimuna.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/46517003357.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/2372456472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=letter+of+recommendation+for+postdoctoral+fellowshipPDF 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_off0000af6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6D 16292 bytes
SHA-256: 2975c84cee2b99d68e966302ef976fa59e0cf419ea433a02ad5b2404655ff474
font_01_sfnt_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 10928 bytes
SHA-256: b15d1072d13698d7bf2bf15aa421a25dd6b6e0fa5818902a9c73d88b9cb86d93
font_02_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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