Malicious PDF — malware analysis report

Static analysis result for SHA-256 261e3c8ef0a53d76…

MALICIOUS

PDF

91.8 KB Created: 2021-08-13 01:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da7ed2430c6bfdee8fdded5919206cee SHA-1: 46c95cb77c40d8964e5ce74a7f5c60da16039906 SHA-256: 261e3c8ef0a53d76db7b4f85f0ba94270ba72783299edaf3f5b82d9051271e31
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, likely serving as a distribution point for further malware or phishing content. The presence of multiple links on disposable or compromised hosting suggests a tactic to evade detection and broaden reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/eca29a285e08ede953bb4d087259c1d9/75999934310.pdf In PDF document text
    • http://atya.eu/files/file/19094545276.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/27679140911.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/dororegudemimujixoxanob.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/86497897231.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1350225e06f5aa7b4dcf3c82322a2589/fukugure.pdfIn PDF document text
    • https://fallsplat.se/file/notedufivotun.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a80954aeb---jazelufikuku.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/simukabaj.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805c79d438e---23671421127.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3cb48467b1cca1d992e5eef62b1ad6cc/xoxifavatatozi.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/kamanukoxonogeferibodivo.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/minusitoreb.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33d1ba77a---wavakekale.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/gobog.pdfIn PDF document text
    • http://apsons.eu/files/file/57329787389.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/xagimare.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/70713270334.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/sajaguzos.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/af7800a3084a2516e6e0c12722d796a5/99156029017.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4ca81fe615f663db4afe36cdfb8a0f21/11447480319.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0a8a4ba037e0c18a676f16cf5b3cca30/mozobanazupal.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/50389428359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cyber+hunter+aimbot+androidPDF 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_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 17420 bytes
SHA-256: 20cdfdb8b1f8691550946c5cd06e74bd32bdf349fab1e1fc620b4ff42fa9255a
font_01_sfnt_off000130f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14909 10684 bytes
SHA-256: ad166299072b24d99c30b51acfffbd4a0fcaf2a8923e2c6622a63066da253fc5

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