Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c7dcc05d141d06…

MALICIOUS

PDF

82.5 KB Created: 2021-06-28 03:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e1160b116538526d0f38df9ad9d5ca6 SHA-1: e0b8aa25fa5c1ee35b047340589bb2d9c45b9ab5 SHA-256: 59c7dcc05d141d06775d3c84a87d8850bf7d5239fad6afe69e4c65d9fc7cee2f
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting suggests a link farm designed to distribute malware or lead to phishing sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings point towards a malicious document likely used for phishing or as a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://elnativocoffee.com/silver/upload/files/sudepalilobebipawuwe.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977e5df0da8---4641955131.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6daeb2a78a---93330998427.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/ninijasexuduguzupevogala.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/35lcgrrq1mobh5d5vd05vht07o/xomevumovebedapabo.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/65eb199cb2cebc01d3d4a463559eec4e/dizagunasutujododorurin.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/1648346186.pdfIn PDF document text
    • https://questyme.com/userfiles/file/23785847581.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8253c6f3---48909815679.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5dc1c75b7---felubazunaxaxubumo.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4nhcme9pdbqgf6c0irrejn1no9/95083776945.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/zegexizo.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/xubilat.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ardpv3c2fstd3e55426rsksa80/lobazufagozozewu.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/62443596623.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/51d4fe5d4124c37a42c8519faecdb543/84723949646.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fa4b665a4---nupomife.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ad027b66---39212155952.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/10901795418.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04bf1f883---wejezejego.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/kineredagifipi.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/16225438485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=convert+pdf+from+a3+to+a4PDF 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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 10700 bytes
SHA-256: 87134e4a341280f523d59f516141d92208bf0137641696065aeb8dcc21153e3b
font_01_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 18704 bytes
SHA-256: c152de20ca7d0c7648105d7454ae6ca42e2a2ad48da2616802de43b293d6e595
font_02_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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