Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5cd558dd0450ae…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 16:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fef33b3b31529f44beb8e2f2c66506e8 SHA-1: 0a95b068275e40ef6fac54a202f05ecb261b982b SHA-256: 2a5cd558dd0450ae90e3606ebea01bbdce51a41fd2cd3d6f1de3f132bf60faae
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The file's structure and the nature of the URLs strongly suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f20e25aa20---30789862377.pdf In PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c76b0bc261c7059f37f94bef914b1c97/senun.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/murabowutal.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/komabetuguzarazamu.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/xudada.pdfIn PDF document text
    • http://usmleworkout.com/files/file/bijezomamela.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/63c70112c830882fb84c7cca486402a2/24455164899.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0425da48---sanewuzufirajejo.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/mapotojisavamobifobejigaz.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/getivexopovuta.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/76748999996.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/fj4qvnhifr41hkijekfe775uc2/ladafobijoviwidosexawat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07c436e61---53645659607.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/98131365040.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/rotolujegubi.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16292082834351.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/65412111920.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608098867bdec---25569816593.pdfIn PDF document text
    • http://compsult.net/userfiles/file/14993175399.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/31035146079.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/xemurujuwofetegat.pdfIn PDF document text
    • https://asken.as/bilder/file/17670053142.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/dapoweweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dali+spektor+6+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_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 17816 bytes
SHA-256: ce982c627dadb7382d24227bc3419d1953448f62a2e3f67295f3eb342be0fb02
font_02_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 10648 bytes
SHA-256: 587417081d0dd80d4cd3555b6e5451bb921c2558fa20b87ee1fcd9d3ae3aee53

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