Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61ea4646404ef4c…

MALICIOUS

PDF

87.3 KB Created: 2021-08-02 08:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 87436866739002e96690b302bb6942dc SHA-1: 7c5b244fb02ee5f89505fe0cfd95fb6cd4822814 SHA-256: a61ea4646404ef4c4c1265bbbcfdfa7235f7e9e059948dab3d358f3dbcc67446
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to lure users into clicking these links, potentially leading to a second-stage download or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0ded29b51640feb63b3a53642fb1aa4c/46807557026.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860029bd57a---xupotozagezuzofatajixorix.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/3543016732.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/76f0f81ae6e6b05cdb6966fe0f3110f9/22271911994.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8c7b5b3987617b89797db14c97d6786a/wilidi.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/soburewewaxixitefoju.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/buxuzowevodenipebawoxip.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/59580557814.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/jo55v1upemj7tohqmf4e4phsft/88213673313.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8afc164f---53881474924.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/3569282621.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/kqk57fek65ei8ddhgak6umngr1/77544275911.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/bakogisera.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6c653cd8---26436530691.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/dekomodogojawalez.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/vemasopopalafetojupol.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/5c0c3ae46b30e80ebc8e98c3eaaff775/babukomo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609df2d863b88---45498002311.pdfIn PDF document text
    • http://LearnMarathiWithKaushik.comIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=verb+chart+english+to+marathi+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_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 11176 bytes
SHA-256: fbe08150a3049a6b62243c39059a50b0f8d76b4d0ce25aa9143a84547b3c8656
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 17108 bytes
SHA-256: 14229ab028f0891cb774e87046872fe99c57845e129c57212881269f6eabc880

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