Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f797d9f125ee46f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-22 10:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1aec99874c8df83a8d428cef5e7cc7e SHA-1: b1c3f30d69438724d0577850e918b575a7b32631 SHA-256: 4f797d9f125ee46f6302ab2ef4ab909dbc9869bf6aa7af2489acd7096fa6d6bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm structure, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://duocthientam.com/uploads/ckfinder/files/78428581507.pdf In PDF document text
    • https://ketdoanbus.com/webroot/img/files/donuninofoleler.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/73101694516.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/vujozatijuxejejegojavajo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148cb255c559---taloroxolununajir.pdfIn PDF document text
    • https://ever-progress.com/upload/files/vamutexiridefexezozoletoj.pdfIn PDF document text
    • http://tochalco.com/uploads/files/nozujuzijegenanikelipobik.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/titid.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/33011319651.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/keteluxuwutinabisajesem.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/gewegi.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/34950539686.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/vivokuxanuredelefewobava.pdfIn PDF document text
    • http://119pump.net/d/files/26160706508.pdfIn PDF document text
    • https://ambalatender.com/upload/files/12983311391.pdfIn PDF document text
    • http://chineseclothingonline.net/File/mapisurezosup.pdfIn PDF document text
    • http://moristas.com/userfiles/files/fimasekafijun.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139edd2eb6c7---febovatixubixukisene.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/tokijejofitenawofi.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/52591825671.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/wufowesawalixetalile.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/21/konivitapesovigaw.pdfIn PDF document text
    • http://findacommodity.com/upload/file/61238157604.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614209ddb73fd---66535853676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=slam+dunk+mobile+korea+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_off0000b115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB115 17632 bytes
SHA-256: cf1cb2ed2e3af0ddc0e25f50b0a69c3aee9ce8f3ed3c074fc4a4c534009bcde5
font_01_sfnt_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 10696 bytes
SHA-256: 55e43b865d4d547405b43895eed45f66de0bcdb89e2f0be779146f2e22c591fa
font_02_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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