Malicious PDF — malware analysis report

Static analysis result for SHA-256 de88e68e2fa95e85…

MALICIOUS

PDF

101.8 KB Created: 2021-09-06 10:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79a958ef9a9ba6f7feafde481816f34f SHA-1: b145524c2206d43a86aa385b83cff655694e7c58 SHA-256: de88e68e2fa95e85776810e279fe3d6a2dc780b330c3eadb4f0f8262d2a75e9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cructi.ru/uplcv?utm_term=combining+sentences+worksheet+7th+grade PDF link annotation
    • http://dzbnf.com/upload/file///69082892627.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/72691512986.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/tutisidogizew.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/pazasetedezagidaxuwafexa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106f98036c8b---wowerezula.pdfIn PDF document text
    • https://wagaskar.com/media/70722848634.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/85396214577.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11fb9fb99---786879868.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/vatubijavoperugemetigaki.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/113626586.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/709b507dphlhst5rsdsvuv8kn5/16039290880.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tkdb2ftvd75sjtg19kf5ei3853/77824222764.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/19200338673.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d69bb6a57fc69e56628854fc0389fc5d/lumanewixaretatixavebap.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/bosenevovanotire.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/55820991780.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/20861127242.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/tujujepururezimodedeme.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/84248730798.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/gugasawirorafuzogejul.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a2f62ece79cd0ab3f7e398cc4ce16ece/11950530970.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f50911a7823---bazijukuwugos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c301b88a9f---livatudelokovuka.pdfIn 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://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_off00012996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12996 17532 bytes
SHA-256: 9af3acb4e5b7923b42141fb17fd31ce48322ba8e9bc2f07c23cde21000cb7167
font_01_sfnt_off000156fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FE 11172 bytes
SHA-256: 580e0ca10767d1fba45a28a0dfd445fb06d5ff687f1443c7fdd4dee78ff58a47
font_02_sfnt_off000170e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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