Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe6a277049b852e…

MALICIOUS

PDF

85.9 KB Created: 2021-07-26 18:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8876ed5447ef8f7f08185925fbfbb403 SHA-1: a99d479cf703ee89a2cc75c1418081eb221cf5b6 SHA-256: 3fe6a277049b852e59a28d98ab28e0bdbea241b18e48056117717248badf297c
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The PDF's structure and the presence of numerous external links indicate a link farm attack pattern, likely intended to distribute further malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d3252c0e---58445729805.pdf In PDF document text
    • http://szao-spb.ru/images/news/file/mixowonolebi.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/duposoxafojegeze.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/43253191324.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f2ed1f694---28970950454.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d88520a2a---bobarajuxoraxa.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/foridiwuvigedufariluxo.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/zoken.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/5db80cebbe9b6c54b6479bc409fb5357/ledatomezaxef.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5bc1c70a52c5d8fbdbc8ceb182774e04/zuvuxufemepiguno.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bobupatuniz.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/oqeos3u1gjq8h14a1ta6vn92rf/938252818.pdfIn PDF document text
    • https://ccskin.com/geektic/files/86804170158.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/tavupuvoziwa.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160785bbe12ac6---sipajoxexatube.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/68581686115.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/fezozozipaleta.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/n5ihp7gk5onr6tct0uf6g8ctpf/xezomudikotokuxile.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/76399240012.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/dfd0a4af803da7f8fecdb86799003e26/52360139397.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/10ade264137f8580579ca5bb3e1a1f20/kibelojobexawesipamipus.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f643210a18---43827629164.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/470eac57c3571fd6cbd7de4dfb1fc8b4/pusazuvelutakatogasif.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/dejixasoxuxi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/pivajuwagaxugojefelobugod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+a+free+lease+agreementPDF 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_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 16656 bytes
SHA-256: e19b175289cadcc179c4925badabc8d2a8e854e1c92e14b87c0059e277f89df1
font_01_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 10636 bytes
SHA-256: 6db618deaceac5482f58b02151865ae33681510423ace2e8a8757fec389bb4b2
font_02_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1