Malicious PDF — malware analysis report

Static analysis result for SHA-256 218cbc570029b9e2…

MALICIOUS

PDF

93.2 KB Created: 2021-07-22 23:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 12c81bb57d58ae839c56c993f7a9c8a8 SHA-1: 9dc21bfabc80fd3d87bcd296d3563806301060dc SHA-256: 218cbc570029b9e2600c080c8aa0a14036a0397a46d37d540acf472aba50a66c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous links to potentially malicious or compromised sites is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://richmore.kr/uploadfile/fckeditor/file/60908329064.pdf In PDF document text
    • http://systemsbiology.at/uploads/assets/file/filaridotifagubediputam.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/cir773ba4ejupk561jjn0k8ae4/53722681740.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/pizodulofati.pdfIn PDF document text
    • https://anaksemut.com/contents//files/20177177002.pdfIn PDF document text
    • https://inncredel.com/uploads/bunusonubipidubijamefaz.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b54f63d6713e91a804d46fc994bb7ae4/36952291597.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/59864219230.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/wosedofekegodazere.pdfIn PDF document text
    • http://4yoga.by/pics/files/xakonajitifidawokadawava.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a34f36b4b0acec0d873bee63fa1216d3/rabosesopojoje.pdfIn PDF document text
    • http://kotolantopeni.cz/file/falunesof.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/9688488875.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c4bb3f0f1---91434965840.pdfIn PDF document text
    • http://domplus.su/userfiles/files/wewuzomimeloleza.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953077e6424---falovapuzodolorareb.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/97292191404.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/63326283394.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/29c134df04abbd1e2f8db35c6cfa114b/46111059846.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b033003f756---galuwiju.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/tasobipumewilesikuve.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/88443664731.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7de70331---gumubas.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/10981112495.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9e076595---bewafemusivejit.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bc91b626d652189805bc9fcbde5ae2f8/mazawezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+normal+endometrial+thickness+for+premenopausalPDF 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_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 11072 bytes
SHA-256: 884530958dbae0180711aeba2812d57598c5006776b1127f36439a32b2b7a793
font_01_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 16788 bytes
SHA-256: 2ba3662fe5c1d8ff108189341c4b6ace00cb7efde89f7f40c6facb0514bc8540
font_02_sfnt_off00014bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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