Malicious PDF — malware analysis report

Static analysis result for SHA-256 33757773baa8b384…

MALICIOUS

PDF

71.4 KB Created: 2021-09-06 14:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3aeb2e132a88906ba6f19a62328bb706 SHA-1: 6644c23518288f0fbecb598b96dea3d270135997 SHA-256: 33757773baa8b384fd5f68a3982470e2dbf873558789e07c926db58dbcacccf4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous links pointing to potentially compromised WordPress sites and disposable hosting suggests a link farm designed to obscure the final destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9d06709531fab4776958eff3f974ad9c/binosututawadop.pdf In PDF document text
    • https://evergreencans.com/userfiles/file/26861707131.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/45614597145.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/saeep4af310vbd9grjc0iudfs0/75691922237.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/xasoje.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/13123825153.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1f732c73d99e416c4e42b6de272534c0/82332912735.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/malupowenexigi.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/541f4d0b7e3c01f2e86f156e4b5dc46a/mirawebimesekebiwova.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0e0b909c6---22938492389.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/56428194869.pdfIn PDF document text
    • http://askort.pl/Upload/file/xubudisexiwaxudusilojufe.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/50544382759.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f159a2dda---34166310952.pdfIn PDF document text
    • http://garderoba.sk/images/_file/28583117365.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/78603581663.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c60d37ca4da---9046519132.pdfIn PDF document text
    • https://hagepoorter.be/files/files/84371198641.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/nilanemedosujuweg.pdfIn PDF document text
    • http://108homed.com/userfiles/files/89461539639.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/94411268904.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/wifabumubesimijanawiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+insect+metamorphosis+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_off0000b59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59B 16176 bytes
SHA-256: 522bd87a476a43317dce6892c9447413b0ab9fcf47f9d9ba8168e144e38ff6b9
font_01_sfnt_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 10916 bytes
SHA-256: bebaf74fdc15c7b460c6b676dcd8776d5d9358339121a684005755931707a257
font_02_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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