Malicious PDF — malware analysis report

Static analysis result for SHA-256 5296cd0deb4931b3…

MALICIOUS

PDF

91.2 KB Created: 2021-07-24 03:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4879a6cef5ed4930048edd03a53731ec SHA-1: 4db9f7fd03ff32ed34977f7181d1db0c2b131d76 SHA-256: 5296cd0deb4931b38ad7268ce078c886de9ffb7bbf451b0235cebaa21a417df2
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, many of which are associated with formcraft or super-forms plugins, suggesting a link farm designed to host malicious files. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple distinct hosts and a high number of links indicates a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5632

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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70a7001ce4---zixuvumabef.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e2460335e07bd84b1a3c38f8eee41283/figutitarug.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd006ca81---dejirunuvowinudopixo.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/lodesakasadunetegude.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/futomobaratofolimib.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4f99c633---67301448317.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/s24uvkdutu85gvso7rihst273f/rovon.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wesapegupatezozujutana.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210502040032595637307.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096d75c14c58---dufozibetakubowikubu.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/50480999703.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/50177319957.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mf5tepjmc5o4qa514htke2oj62/motuviwadomejoril.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/71620763464.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/2147898916.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/voloxigubajagulafusaxemu.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/62795531652.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8ir4n3et8s96pl81jojmdktg85/fulokazajibirawejel.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/dc335edf9e5dcba1f458b1b412690572/90168755701.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/lanitapoxufegevo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a488ff4505d---befubopikisosodaf.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/29869834790.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608281aa2a889---tufemoxopesakepilape.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baeb939607---76411200094.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/48d2157b25ae764d363200875008cbee/73520377284.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc2c1aaeb3---zuxilewabovazezogeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=problemas+sistemas+de+ecuaciones+3+eso+docPDF link annotation
    • 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_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 18120 bytes
SHA-256: 3d924aa861d7ffe53732a1b6e19a418177d2f5a3bde410ccc7e4d9043d533b5c
font_01_sfnt_off000141e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1