Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed2fd0f105d2261…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 13:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8a3033b53f39c6e7d29f36ff9bcca570 SHA-1: 2ecd33b4328146444d215b9d7d31122e5b63224a SHA-256: bed2fd0f105d2261f51cf8929914e030001d883b264d3bfe0942bae232d5cdbb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are flagged as potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URI heuristics and link farm indicators suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://stillincontact.com/images/mails/file/13837587872.pdf In PDF document text
    • http://lutechmed.com/Images_upload/files/85479033282.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/zisadakekotebuf.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/46802521697.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/betomewikaxesunimoli.pdfIn PDF document text
    • https://foulardfotografando.it/file/najaxux.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/13659782529.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/95817869385.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/84817901944.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/55524446.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/36787753928.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/dedadikotekadulowo.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/zigesozawuguxomikelaw.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/56113220149.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/gujafikafowixofetebutaju.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/guzisunesinu.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909060429556542.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6d330e5aee0d82a73f57d030e6672f67/57217088080.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/jadezipidelozorelixud.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613540875e9f9---bolegotofenuwag.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/xerasufifirafab.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/49495742624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=justice+league+snyder+cutPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ad5b2325---xuveze.pdfIn PDF document text
    • 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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 17908 bytes
SHA-256: b8c25f01d363055b7a99e18cbce65982c7436f032f16cb249a635f7950526199
font_02_sfnt_off0001227a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227A 10632 bytes
SHA-256: 2ca94fe58c7d6e33ed8ef4670b270c89ad2b3950d2b3d99a091e3db630719566