Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3b67868a2a9f9f…

MALICIOUS

PDF

109.5 KB Created: 2021-07-19 00:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c3c4fe7024e69da77c37e9c3ba0819b3 SHA-1: 9bf6a85e394637a7dbc588cd787e03ed3e646d18 SHA-256: 8b3b67868a2a9f9f7453994990aca82ef4436dc5f79df2e5540b5c21e2d5578e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of multiple compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9ab2ba35c0fa0a170b927784ae34a663/3963094775.pdf In PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/37305754595.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/83088443680.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/2732399832.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/92b2b6426fb82c71798fe88ae9c7e561/17465371834.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a88ad5ad4b1---vitukuzitegukozuremomavat.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/danin.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/77341608282.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/mawagaliseludajakuj.pdfIn PDF document text
    • http://ruresept.ru/files/file/69692264572.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/2fbdb9c76c4a36047eee98c05eca8aa7/wibol.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094926721aaa---dekujaxisupusopo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfacd55073---gobebotisaganorobesa.pdfIn PDF document text
    • http://blackshirts1961.com/clients/7/71/7137ee3fbd99c17d296746b31d66a47b/File/42160959508.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/lududenapu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0fc3b968---67817658774.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/75652003038.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/lipigekepolupevanuvoli.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/90207255274.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210621_7E0021E3214B8EDB.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/33131215933.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/4m7vk1feecffcmggde5o0avc0q/xaxamijuwopibavagugojuzir.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215152314265189.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/ruzol.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a2f1ec443---4735719783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fire+upon+the+deep+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 17244 bytes
SHA-256: 4bf7b9a2a722a9bee5546f0e553f83c1c30ab27053a319ee24f73ca0ff53db28
font_01_sfnt_off00013498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13498 3848 bytes
SHA-256: fd989e9e61b347f3f9bac50ce22e03c9814edfa1c67da3280574e9dedd512561
font_02_sfnt_off0001437d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 10296 bytes
SHA-256: cd9d15659a6d244fb46e88ee76b9d3bd7c6ae79983503800f49fe2be89d2cd54
font_03_sfnt_off00015a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A84 21264 bytes
SHA-256: f3ddfdfb4893ac7225d11bca33d920036cf97d9565656d49b05dafeb12c4d4a1
font_04_sfnt_off00018fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.