Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b450a534cbf9b9a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 03:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1316d3d557fc24a073c424db0e296dc0 SHA-1: e4faa9470af3321d296d97318df578f4b67cff63 SHA-256: 7b450a534cbf9b9a86acd4f53066c9b2dfa4f45894c23162826dee814652045b
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://massarentearchitettura.com/userfiles/files/sasasonekegar.pdf In PDF document text
    • https://hetodon.com/fckeditorfiles/file/pezajukijet.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210911_E51771E7F1F7C649.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/xawalikir.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5e95fd7b0b7eb481fee43f225925e072/xiwajujiwudekaweruz.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/45884164403.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/57040019894.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/xevenawida.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/kadom.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/waruwuwunulezavujosolen.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/26076009807.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161467e7dd2e22---55368343907.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/gubabilewo.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/kamidaziwapemi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144cf8b346ae---73992973135.pdfIn PDF document text
    • http://apvn.info/userfiles/file/domexefubalokodop.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210906212850.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613062696256b---82215048763.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5f62c5d0cd9a463fd9ed33e8031ee08/lelajejeguvefusitaro.pdfIn PDF document text
    • http://na3.it/misc/file/xebabifuku.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/lifolezilaxigovedod.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/29014413812.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/wajilonevezen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+facetime+compatiblePDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 17100 bytes
SHA-256: 9d287e25963f92031898ac2db4c3cabb58fe7dfa8d86cea3fdeda130fdac02a1
font_01_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 10732 bytes
SHA-256: a115f84ce231860e40356f90253a95d8602a3abac6c3cdcf41a84719a8a45bfb

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