Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e6906983140c6e…

MALICIOUS

PDF

85.7 KB Created: 2021-07-28 06:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8952cc11f7174c4cb85ef8f5d0093b47 SHA-1: 13b9740d9019143975d74a2e686bdc39b882bd14 SHA-256: 65e6906983140c6e50634813e2f4d25ff53086df85eb9b6e0a735675db4eeea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this, indicating the PDF's primary function is to act as a lure to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/vojuf.pdf In PDF document text
    • https://eyetracking.pl/userfiles/file/26532658497.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/80122921594.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ds5li838lokavmkreorlkcrqeu/67635980640.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160736e6a7a115---dodusodebosatevuvifisa.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/6573ed0a50fe1fd3d308374ffd8ce3f9/xipibukaxabexojifefube.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4328b28ea85af56f4ffe3bcb28f0be4c/58370484998.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2ct8bia0m5n7ssmk3r8s2lpr1e/26863599916.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/vavanesekixazokaxiweke.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/kapelo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46efead5ed---71320411654.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/vudekanuzifadi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8132t8088fabgnt687drm3kgn5/fijopikokipon.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/32832463162.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/97546192622.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/bagidodeta.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b759e704739d68902372afba49f1c782/leleforasogadexi.pdfIn PDF document text
    • https://amblamy.ee/upload/file/pizig.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/gomagiwezuvavawufirubeze.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca25b97f4---povilusu.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/68616237015.pdfIn PDF document text
    • http://museeducuir.org/upload/files/33949547963.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/140cfd56771ccbb31a7da51f21835ec1/26789414232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=libro+la+%C3%BAltima+oportunidad+de+carlos+cuauht%C3%A9moc+s%C3%A1nchez+para+descargar+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_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 17468 bytes
SHA-256: 899f6bbc5fe41a31c2d749c33e0f4849e70f0aa9269a5a4266192369cb87849e
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 11772 bytes
SHA-256: 179b3c58a997541c6097a633b48967d50925049ce18f2a7fd323afc7cc251842

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