Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62b85cf5ceda3b9…

MALICIOUS

PDF

72.6 KB Created: 2021-08-13 23:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 775cb8df6ba4da7825070c3df1b7ba2e SHA-1: 07f31881df9a458103c97d5bed616a64292cc6f0 SHA-256: c62b85cf5ceda3b9db0958ecb2fe45bd61929297acf1875612a01f11869bb5ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://adlinefor.com/home/webagen/public_html/korn/data/file/pavefopusubuteb.pdf In PDF document text
    • http://esistore.be/userfiles/file/10989993141.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/8448227e4848faf4c87eb0ed9f87b8c8/lapoxujelumuwovemaluset.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6f3178742825730c4fe2183b215c0311/sibed.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773599d4741---darenifu.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/55916473974.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/xifexagu.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/844067439.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/2625189972.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/15909832165.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/likidexulezuwiket.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/61e44888871978d68512a4ebf4b55a53/16329085615.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/80907463144.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/55873550771.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/23124454191.pdfIn PDF document text
    • https://fishuntpesca.it/file/famisukozedave.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd2004682d---24707675415.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/zowemo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609173fbe218e---kivuteku.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/98176828313.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91819171d---53972833668.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa54fcd5a93---suvetitovamomujupofilifu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161106503dd957---pejovedex.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/xipovozesan.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/7rjh0nrtepfavobrmkbm8ufm63/tewejakepixibeduko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=desarrollo+humano+diane+papalia+13+edici%C3%B3n+pdf+descargarPDF 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_off0000b8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CF 15464 bytes
SHA-256: 1cbd5af8bcd8c42790a66de5f6ebd245b617f1e34bd88bfe47dc12fe3b2fd8aa
font_01_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 11432 bytes
SHA-256: f30d6a51e1658434a47e15a2cbdebf64b2311cc7df474027545390bdd0ce9b04
font_02_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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