Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e65b85240758c4…

MALICIOUS

PDF

76.4 KB Created: 2021-08-24 21:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55a20331d59e1719ba3699cd75da5ed5 SHA-1: 303b958444536658c919f002f0d6c01b487f4f99 SHA-256: 88e65b85240758c40a16af5de1feaebc89806a34dec52d92cc68c250527e1547
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains. This pattern is indicative of phishing or malware distribution campaigns, aiming to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5631

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 http://karpatskiles.ru/store/file/34145956938.pdf In PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/fc5fc2d7ab713a0b64dc26654e3b91df/nulifukojosejigu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/rds8i4rcd8sivh7ir2ebgfshe1/vigewari.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b207b7b8f93---jetivusuzivuvo.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/56984566164.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/nezezuzibagetamanoz.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3a9ca57824ca969cf51e4e5f4bb733f1/14496973964.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/19417507533.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/luxivisumazawaverozoj.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/4206102845.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/57648143529.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210810_104906.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/pemedifasegevazamebew.pdfIn PDF document text
    • https://pharmavet.co/userfiles/file/61487485811.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/filejunixibetirok.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878c3586156---40792732579.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38833b356---24448418966.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/11745691647.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/gipabinemizinapud.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607222cf8242a---66658032046.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6d40d8e191995b14296d34e0b8a7073/91783464893.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/80364045549.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/77681999176.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebe8fe7aeb---wozilobelabakuxozigokofan.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0122125a---69001553631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+snap+score+up+quickPDF 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_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 10920 bytes
SHA-256: 72913f7f7779864f4852819ce2b3d32450ef26d6d3ffdaa9fc46fb2232418365