Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da911309bcbfaa6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 10:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42b4c49179a4d879f0ba111e50e918d1 SHA-1: 4c954a13aee15b0a9d8021f7910952cc01aa0b41 SHA-256: 8da911309bcbfaa649a53d76536b4cdb6120163dc8c2d0cf4d0b95dc55698474
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9e87f966641a9c4d7316221effff575e/devam.pdf In PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_AD6AE38C8F8E6470.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a6bfafc3ab1f3d6d90e4431a81a74c32/rotetuxojofi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137f06a28b50---22757497971.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/mitapovor.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/2645735926137d50cdfcaf.pdfIn PDF document text
    • http://dytac.hk/userfiles/60338675536.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/dilufiketubuvumi.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/rimokewezir.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/faroxe.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/02/somumuwufonopirizepag.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/5270250183.pdfIn PDF document text
    • http://starma.pl/files/file/rupebola.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/wonozakaropa.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/78503943815.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bce9a60ff8---68694414156.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137350198a1a---97855959272.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ced00778---mutuveruwavodokoso.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/velusagi.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/31140147872.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/56133662142.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a4r2ilpun27mq20lscnnidksq1/91898427517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+guy+torrent+magnetPDF 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_off0000b9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CF 18292 bytes
SHA-256: f9300e918d2a2da7b22717829c9725495c753291b3f3fe401025595854d1ffe0
font_01_sfnt_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 10336 bytes
SHA-256: 3ed612a98a75113ed5facfcaa03e0b4e432b10621d221f5084b2a351a9411def
font_02_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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