Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fe23b8fa8098df…

MALICIOUS

PDF

94.6 KB Created: 2021-09-13 13:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a81b7e1ff93c07023e75202f9b25f4c SHA-1: f73d10346e3bd81b05e11b86017fcf07cec438f1 SHA-256: 72fe23b8fa8098df20919c3992f278bf72dc3f2cbd9cddba8dba31b843db3343
196 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a lure for browser extension or update installation, a common social-engineering tactic. While no scripts were directly extracted, the presence of numerous embedded URLs, some pointing to compromised CMS upload storage, suggests the document is designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ddaengshop.com/ckupload/files/18108653578.pdf In PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/levegige.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9d1f16bd---zutotora.pdfIn PDF document text
    • http://fxmeat.com/upload/file/98099d6a14847d147be8033cd965602c.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xiverizenewajetapo.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/pufofofukixujanofezaf.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/sosowo.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/7890444187.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/batevisavetagi.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/lunibutonepi.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/nadegokoxafalimi.pdfIn PDF document text
    • http://generoussecurity.com/uploads/nevabuw.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/13692142162.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/23512797625.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/vavevimazujozupenukat.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/63932872151.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/59883701742.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161331ad55db06---xeruwurirewemavigap.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e520a73b59---budoxagumudeb.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/7355330036.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210912035554.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/18941327602.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/77513209416.pdfIn PDF document text
    • http://ubest.ru/images/file/34650697135.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/95119444699.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/wowofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+find+out+who+looked+at+your+instagramPDF 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_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 18784 bytes
SHA-256: fd98c5bcbecc437be7a1ba1d0975debc7cbe9e925996937b605d473ffa658a92
font_01_sfnt_off00013a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15244 11184 bytes
SHA-256: 3896d876dfdda55d91d92dec49268b95c518f241a31740f4929d2400946fd998

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