Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2e7d18076e7e19…

MALICIOUS

PDF

78.0 KB Created: 2021-09-03 03:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b81ea1f92f1f80d326555b00ab203b4e SHA-1: 48ad630062deedbfd383b3f0da137e42461a2717 SHA-256: ba2e7d18076e7e192fa61e497b4778b9c291de9a0f8f8969b757698161fbac81
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or SEO poisoning tactic. While no scripts were directly extracted, the nature of the links and the ML classification indicate a high likelihood of malicious intent, possibly involving the exploitation of PDF vulnerabilities or the redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://eravukappalpalli.com/userfiles/file/62630840998.pdf In PDF document text
    • https://ev-owners.jp/userfiles//files/sirejiro.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/bakojulama.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/zisopubituzilo.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/91711557376.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/tigakugojipanupiporukaxi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d581f19ec4---wibasitawakitolutunapolim.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/wefaledo.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/suwupag.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/volewokurulijedisadosa.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vd6gk0bh0gnd26otb6jai0u02r/32870255405.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210613041836.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/7597181085.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/julezasukarenaf.pdfIn PDF document text
    • http://apicn.net/upload/files/1223321526.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/53241524244.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/vemoli.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/92585125065.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/bavogojugawomoweve.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8115d55c---26595110967.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mimilapelefosobapafogofis.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5548cd066---gokulaxuforodatuvuf.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fjf2lhi2d51dsot9cu9fvjj7ie/sefijopubexajazidewotuwal.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf08125c01---wosuvamikenojuselo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817615a80ad---zofoke.pdfIn PDF document text
    • http://maidichike.com/upload/files/1056025505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=eye+anatomy+and+physiology+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_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 15888 bytes
SHA-256: e777007c18647ee847a4445f59aaa98cada2328cb034248ef653b2b6f900aeca
font_02_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 10944 bytes
SHA-256: 5796e55c859230633e39db2defab49cbd7aa3f181bd92f1d997b999c11add31b

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