Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfaf2f65eae8c31e…

MALICIOUS

PDF

152.8 KB Created: 2021-07-04 18:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad531260d03dc1275b59225f5cac47d1 SHA-1: 22d5e1a245c14573e0fbfc73e57914c92daafa4c SHA-256: dfaf2f65eae8c31ef716d4042c296db313c085585105895408a36f705f28e349
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://bkbflooringusa.com/userfile/abbey/file/bivumezexijujakisame.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/362159fff933f874ddbe7a578886bb82/94783778449.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb48435e2b---56838721411.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/nigorun.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fadb8255---reranej.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/628b7e28ab80b37a592a7c08ea7dca1b/48314654539.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3ce820f625ddb10e286ecacbf592a347/xuduzeza.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/536485c8b727190d78d6f07fd6a3fc57/52848961145.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/711c2bd0459c2a5bed48b93b9c58e6b2/sojebagikubi.pdfIn PDF document text
    • https://sbufficio.it/file/gixuwatuvisufawutizedev.pdfIn PDF document text
    • http://naucseto.cz/storage/bazatilet.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16075aefe32ff2---niwakinalil.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/9gdsvotv2ockghvb32900k77f5/sezoxagasujob.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/72703866462.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7941389ed1d0db1c73a0a6f6627067a9/jotesig.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/92877874416.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a1d1f700---konupamazafadu.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/17483738106.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d889b073477---25468844430.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/144a62bf9e6be0b03666259173738442/14721845332.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/kejugagodoxiwer.pdfIn PDF document text
    • https://yuktogel.com/contents//files/vixoduzog.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/39585166861.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/90249805021.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/3561135437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=low+carb+dinner+ideas+for+familyPDF 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_off0001f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D1A 10836 bytes
SHA-256: 0748d9414d171125a5ca2859f6660d998b931cd51197b2b0508b0c68bbb7cf5d
font_02_sfnt_off00022621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22621 18232 bytes
SHA-256: 98fd3b8610a909b8302b502e2d35025f1aeda6267b1123982c18b823e4af7c96

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