Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f41edd47399d8cc…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 05:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1899b6f19dca78b0d2cae2ad57bd7737 SHA-1: ef4f6df31fb6955411c9b54ff95ef7523f7217f2 SHA-256: 7f41edd47399d8ccbce19e2aa407a0f35e1d6f5ec499dafeea6bf842bf5a5701
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the malicious links or to directly redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2at4uvtpbkiaf6nbgcv7ai0sl1/98114152427.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9314e6e18d---82616216546.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3d21fe9b3480ee9d14dc677ad2df6a64/72071510868.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ro0c3k730q2ti3fbh9gipfpkcu/popubujam.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134228605d27---naruwijoximevoxesij.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f613848cdd9e169c24d385e747ab04d0/91192241681.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff565da3f8---tenodifexokaxozato.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/iknkbqd9vkt6bfcvs09fq0kut5/66737498246.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2bb7178159a30e464ca41cbcbb4ada41/79382163246.pdfIn PDF document text
    • https://magerp.org/upload/files/67819954653.pdfIn PDF document text
    • http://greenld.com/userfiles/mezudazanelegigixujed.pdfIn PDF document text
    • http://aurora-c.jp/files/files/givakisipu.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/63992924170.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/19761824312.pdfIn PDF document text
    • http://djpress.pl/Image/files/23345875905.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/34496391294.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/99726733610.pdfIn PDF document text
    • https://tarsiman.ee/files/file/demepujukor.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/zinevesagosapizelekimutu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6d70059d---14957731476.pdfIn PDF document text
    • https://campermagazine.tv/public/file/pojimoneguzipivenuk.pdfIn PDF document text
    • http://envigest.cz/upload/file/98555318126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cerebral+palsy+adalah+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_off0000bf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 10468 bytes
SHA-256: 1f03c009f30f0fc29284b2e24be17cd0166f2d5c36b77c8aa8e70543e3a27aa9
font_02_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 17112 bytes
SHA-256: 938eba63945e55e8428401de09a57ed48ad235ff4d24e6b39362428eb2362c7d

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