Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafe28aed19cb80f…

MALICIOUS

PDF

90.6 KB Created: 2021-08-05 11:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b40b26da881bd7678ffee5928055395 SHA-1: 785f2eb70b472afb6223ab299ff24aec5856e880 SHA-256: eafe28aed19cb80f99074dc1751cc225fcaae3f9ef6731d09d68a83d80fd3205
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage, with many distinct hosts and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the numerous external links suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/3esd95ncqti3ifaiascfnbl6bp/vonigumidozuxobemojizenop.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64263dde37---suwinifexokozulug.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/06baf80132b5e3969074e169a0e3b398/nugezutowonamuxukufa.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a72817795ebdebd1fcae4c78c8a6ff00/bedozaninanabazon.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bifusolalenufowenan.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/vusuxuput.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0ba770f7---duvaxawe.pdfIn PDF document text
    • http://remobudostol.pl/pliki/91041353779.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/66561259884.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210614125732.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092f65570701---lapedojiruvibubexag.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/sogepalexoviposinu.pdfIn PDF document text
    • https://sy-tech.eu/file/kovijizutekemewi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/293bed73076687092826a3535f86cf32/29664099567.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080299e708e8---zuduponebiv.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/99112661485.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/24977066016.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd3f01fb9---niganu.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/19766794163.pdfIn PDF document text
    • http://3sdent.com/upload/files/17451701585.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/xapiviratinuzevan.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79756b9cdd---mudenemam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+best+dork+diaries+bookPDF 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_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 17384 bytes
SHA-256: 6309952281baee23addad420b4c4df54a49868cd6f38c1f0bbe579516be9ff29
font_01_sfnt_off00012c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001446d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446D 10420 bytes
SHA-256: c91a7b65d220fa1dd1338dcd73981625028fe31d2cb436e0a67f983ecd2de882

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