Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1f7c5239d213ec…

MALICIOUS

PDF

85.3 KB Created: 2021-09-15 14:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0199709d52d89c77603dc6b4831db3a SHA-1: 74239d66db5978de3581d1fd4735c79d6854286f SHA-256: 4c1f7c5239d213ec6f0a90dc8f9cb4e3cec38e87948bba7b4ae6e37d456ffa00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or redirection attempt. While no scripts were directly extracted, the nature of the links and the overall detection suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kanizsakran.hu/userfiles/file/63044520122.pdf In PDF document text
    • https://kingdom.vn/userfiles/file/wamereretoxakadebazux.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/pigadofap.pdfIn PDF document text
    • http://le383.com/uploads/files/40170380547.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/dc2702652b3d845dbfd16bf8511bd57d/mugaronolakevudeko.pdfIn PDF document text
    • https://km2804.com/ckupload/files/51339559804.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/dikuvutuvuponinajobe.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/nidol.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec961f300c---wukon.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090321512133.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/wipirumafuboribowekakovus.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jesigapamosogos.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/zowesigoborukujile.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vb6dmr2po83hmj029hbiihjrfe/27402280636.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f35185eea---13043289611.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/90672689170.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/jowositapukaz.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/mozole.pdfIn PDF document text
    • https://wrd13.com/force/file/tolukozubimunedovezidekis.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907232537751564.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5752f9021c9f849de444a9cc567b24a/40901483776.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nbn6bs3l0v01sh0akob5a4sqd2/jozarofunedibojikedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+native+interview+questionsPDF 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_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 17844 bytes
SHA-256: facf17857aff2702651d17dcbfa89c9c0631a461fad48d88951f924e0784e881
font_01_sfnt_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 10576 bytes
SHA-256: 2477ac937b3d005dda867a949da05243340614d0222b769799efb3d1e1c02f9a

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