Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bead76dff7dd7b…

MALICIOUS

PDF

102.4 KB Created: 2021-07-26 07:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f5942c827a531139a1680ff705f63e8 SHA-1: 3adf5ba4f0480f724b981f4366438e6b66f1df0f SHA-256: 19bead76dff7dd7b15872bdad93d6914f40d45340c382adb7ddde3150757dd5e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosted on WordPress installations using the Formcraft plugin, suggesting a coordinated effort to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3557e3bb7f---6009072667.pdf In PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/bepesu.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/3969210250.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace37898098---26809367189.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/49441223311.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ff5d0ea64---47582352247.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a524e87b5c---rirak.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wiranupolaxon.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/61305684572.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4083e0d5691dbddb49b24b683e94b966/xirawenixaponip.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abca1ae7562---68957828948.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/pikunemuvejemi.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gapemodenubejiwigadimud.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/92s19j0e1vcpioss7ne265dgnp/21268169175.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/35472600090.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sh4rrsj1nd7tdkanugpnrb282l/sivugajokus.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/xozuwo.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef6dfa935f---55784169526.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///60394001662.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/mavojexixafusezugobinunot.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210624231746.pdfIn PDF document text
    • https://anakmeong.com/contents//files/40233710383.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/35119306331.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b1f4d1f7---majamipuvim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=scary+stories+to+tell+in+the+dark+book+3+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_off0001295f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14176 11308 bytes
SHA-256: 25ef28754be11a2fec70253ffab960a987d926c68a1914fb09170573a95f02b1
font_02_sfnt_off00015bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB9 18028 bytes
SHA-256: 625d5c2832f1a2a0f78ceac287425e93e5de2f43f259fe61073f975a4705942e