Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f238ee4b2b9281…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 09:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 99b13e10c2f53c6801c8c24983994b13 SHA-1: 732d63981135688df21c22d8669de61a3246759a SHA-256: 04f238ee4b2b92811a5d41731efc657dd04c4c3f556fe0f0581ca0a0efc6e553
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning tactic. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://prawobrzeze.info/userfiles/file/45012530468.pdf In PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ifjtv8eg3o86e9v0g6t0q4eupo/89763269384.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/zusabafewulaxona.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/67125700730.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/36876957376.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/xetumufabus.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd24253a6e---26956673766.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/19857677108.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/25131932481.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd69d528ac8---noxubevitanefem.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/94ee85a845880b219b2bf69f4d61a538/zukigiveripumureguzax.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/13228377117.pdfIn PDF document text
    • https://artenika.pl/fck/file/59715763791.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/23epc70ql5hlpp2i56nd83aqe5/24312839267.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/709d3d8aad84c445414b8231807389d7/vivuzitulupavuweziba.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/72722816014.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/26950870704.pdfIn PDF document text
    • http://ippon.lv/uploads/File/67541163968.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/misuvu.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/gunapereg.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/ronomomojadifawaxoso.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1e9b4cc2a225cb8dbded891e7009dfa2/36966755231.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c786901749---zilukewoludujimo.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/pugoworukuxi.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/20710825981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=add+and+subtract+without+regrouping+worksheetsPDF 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_off0000ced6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 16408 bytes
SHA-256: ba7bd1500b041ed0d2112af9743d3c6bd3ae7da82416d0ce95c5d9ac3848e623
font_02_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 11148 bytes
SHA-256: 095f51168cc244c5292bef14dbeeb28e30ad13af886411c88e0eca88119fb937

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