Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafad6c8126804fe…

MALICIOUS

PDF

92.6 KB Created: 2021-09-03 21:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4c12f48b45ac311b7bd57fee876a726 SHA-1: 08b4ea855c725e0366d5c8e36f1aca757aaf5e9e SHA-256: bafad6c8126804fe340c9ce7959b473ae37be4d1389f6e802735b47c3f565863
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

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 https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160767a7c179f9---viragewubasaxalusowodepi.pdf In PDF document text
    • http://www.kotolantopeni.cz/files/miwir.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160de177ed9c3f---12218907312.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce5a515a6---kenuwelirit.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3d21fe9b3480ee9d14dc677ad2df6a64/72071510868.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/56443680108.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/26190237668.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c75a5e3ab1ed5b030df6710d94c12716/61274492244.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/jobisifajesufumanebikik.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/likelevap.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8bcf05722---65724607373.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/41078177579.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1551ecc2c8661bf31a021e54733387be/86597337889.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/86647141589.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/nukinawokazidatiwemik.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e54d820b40e062eecb9f9a5bebf6123e/lelibiwonanaze.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ba1422851---53163116423.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5ea8886be56b2c78360e39e336f1df91/20175149759.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/manoratad.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/86406515945.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/32861816503.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/zajekugoxupoxu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce20ba227---9802551196.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/levadevasarepuzabufis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=environmental+pollution+lecture+notes+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_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 17784 bytes
SHA-256: 118bcd378b1f75c7d5c4e4fd3dfb0b79609ace02b19aeacd90c5baf6985cf5c2
font_01_sfnt_off00013304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13304 10928 bytes
SHA-256: 365634638e9a8085596570535afbba9f4c0c7fc4fe7fef6e82ee16ecc675cd0b
font_02_sfnt_off00014c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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