Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dea0aae7a273228…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 13:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b66eb4c3ce1d575e251ee7edae2e447d SHA-1: 0c010d2f55aefcfef2705a50d9319332b48a8ba9 SHA-256: 4dea0aae7a273228f51c844d0ff460b8df164e32e5141c1981c433fdb0c96e84
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to other PDF files hosted on various websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised WordPress sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=odin+flash+stock+rom PDF link annotation
    • https://cpsguffanti.it/uploads/file/jevejapopujeb.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/5710427082.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/25063009111.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/45574797160.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/kalulabukufonimiroperelen.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/14932859193.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/sozumebomifo.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210917_075900.pdfIn PDF document text
    • https://ocloud.millionserenity.com/images/upload/files/46835264681.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/15829041772.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/20771836853.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/245735033.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/80158659959.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2e191c459323b302650e3f49ce9e0a18/53717984922.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144b9c570935---judipozifiwupujepigipurop.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/20971610180.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/gidavilafutozela.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/rokudar.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5e9ea3ca74883e23cba89d4e569d64f7/tijamubux.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/dumatugupodobege.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xulapojizapuvomifuzuxem.pdfIn PDF document text
    • http://linker-apps.com/files/jozovesanesof.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/20762187933.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/37915290491.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 17916 bytes
SHA-256: e422fb3c32c61c205555a0292df5e492dc5eaa85dd0cedf83ff2274d2874c315