Malicious PDF — malware analysis report

Static analysis result for SHA-256 f882ce34b9e38274…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 22:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86adcd09e965dfb2291d1770ea8625cd SHA-1: b8f189e942a90b05f400a3082f23455ebafefc5b SHA-256: f882ce34b9e38274a4ca5108e6c6ae95a81bc7073f6a45553489e216fd714d04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zatexpress.com//upload/userfiles/files/vudalip.pdf In PDF document text
    • https://charming-dc.com/uploads/files/202108160330509770.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085838e5bbf1---nopapivelusosuxasudakaw.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/kagip.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2120a5752d---puzisikapujekujopebebeg.pdfIn PDF document text
    • http://uco-kampen.com/media/files/63202332934.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/30253029256.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/luwezakupi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4827a4dec09da7c650988ce73bf4906c/39462439898.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bca11225a36---gitejaluvividopefin.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/fevepuvapufaxipegode.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210803122740.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/50091999960.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/9250188042.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/60464440489.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/wimivovimuziwupaweguja.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0373ba82ba06b8ccd5310f0216701e22/rodarujufidotozuwapediba.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210529_C099633754D830A3.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f511c8dbb---91935368806.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/lerotuvomuziv.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/94328451685.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/86928772048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=disaster+management+full+book+pdfPDF 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_off0000bb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB52 14908 bytes
SHA-256: 6e7a694de5ae2d00f6fc4bac6dcb69dde05343ca0a6c5ebefce7776971ab4b4c
font_01_sfnt_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 11176 bytes
SHA-256: a0835f1ebc06691dc291074e5dfd399e3225374faf195dda24dcc42e58393751

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