Malicious PDF — malware analysis report

Static analysis result for SHA-256 98df66f72dfc2d09…

MALICIOUS

PDF

73.3 KB Created: 2021-06-09 00:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1d65aa8252570905668dff2a5eb2d046 SHA-1: 9e36c4bea343ce49ad6fc1686f50760b7b818689 SHA-256: 98df66f72dfc2d09d492c7d41e54e11f4fd78ed77f8599f579af8634f1d8e9a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The document body, though heavily obfuscated, contains references to "Autocad 2008 windows 7 32 bit", likely a lure to attract users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=autocad+2008+windows+7+32+bit PDF link annotation
    • http://bocghebinhduong.com/media/ftp/file/24826956511.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/68662222266.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/v17nsbd89nrs026f2lrvguj151/nikujabupelatozipixidaf.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/16867778574.pdfIn PDF document text
    • http://thedreams.cz/files/vewodo.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/radadejabaxulefidefevi.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad22ca7f618c68f22f5d623b060b086f/livaj.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cddbb02391---89610227463.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c76d4392---xemowetubesomegen.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/634f7b672181fd2e954b6910d5a0d06c/29106686309.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ae98aea8475bd0b9eb22fe0bc8c1d5d3/86836838273.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f7348481---41938521681.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/jakukajarijofupidekom.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/dudodawaxexetezofoseka.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/77287710919.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b42597e75---42555858256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 5736 bytes
SHA-256: 04261079312882b971630a373ab7d7f6f3a064bc981059ef2a0b387e432ee7b2
font_01_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 10924 bytes
SHA-256: e71474dc4620ba005ccf20989e4c581b8e05dee9e426454b6cca87a047ac185b