Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4eb1e1fdf17dd5…

MALICIOUS

PDF

90.2 KB Created: 2021-09-06 19:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 123b235aba9fad5957f41c51eee57a73 SHA-1: ebcaba7a211554f4abe4ed5ba7903fe7899d941d SHA-256: 9b4eb1e1fdf17dd51fb5aea945c1f7f3f16b620a9eba5fe246dbe4dca4de056b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing attempt or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b625a1da---75019114713.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f844a615230---43366427179.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/6551931973.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a4425da06cc98378cb5852c6ca4b186a/69725390397.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/24399508071.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a4dc8d4e8f81ef5862c0838b66ac5c62/tubovilokadaxomisalel.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/nepupuwuf.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607170eb83471---58987947812.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d91e037c6a---diletifenuzosamasenejirot.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/wigulozaninedegesive.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61bc139d0---95484751082.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/toturawax.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086ed3bbb391---nitizilinimexu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/45ba80f1b683b8990570b99ed4668149/jexewokigug.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tot0j2sj13bc3a648hlf61p8n1/mofimawuvetanejosiwugom.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cba53de6a---kagexazujujekixo.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/tovuwutuxefanomaj.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/foxef.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/55614315960.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608284f379a86---zaragejeroxezamof.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/mesolalo.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/jijeva.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/22387951205.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/rabarowegezujixozat.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/39841876945.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/guwunagosejirimuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=somatotipo+en+deportistas+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_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 21928 bytes
SHA-256: eca8f79b7b314654c54fb5a7299f24e87e89a91df259af0a9c855bb006c3c505
font_01_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E0 10688 bytes
SHA-256: 5b7ed72bde86ffc04b1b4facdfee388d2306cd4f78fd3568c3cdc34c06286aa7

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