Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee496e9ecb4bf93…

MALICIOUS

PDF

86.1 KB Created: 2021-07-07 02:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8858ece8bcbe3de10835dac037ea1574 SHA-1: 73bad8ae8d922f2e96e31d20d6ca2b59d1accd69 SHA-256: 9ee496e9ecb4bf935cddd05c5b7d752eb2d2c6cb839659dc502eb86e2fc2f383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://coreaad.com/DreamDataUpload/file/duvokelogazurexexesidanad.pdf In PDF document text
    • http://shuswapladystriders.ca/userfiles/file/zanemuwewafogom.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/227da0143bb84c6d1845d066780646c5/65980890447.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/84527664927.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/forosu.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/lozodote.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071229552118---76192365805.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/73ghehj1qij7je5f0cl7860rd3/47650431735.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/672c4f9d650c2c7d354d9cca8920b608/jesalizigesufapadejagotu.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/wasofotexojujekevidefam.pdfIn PDF document text
    • http://amdind.com/userfiles/file/37148653080.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/32278298825.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/10022553406.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/lijobotenokapifimoxa.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/39475155630.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/30/file/20210630_073552_108.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf818fe9d97---mukedebugafezowujurex.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/tutuziwivakawivav.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/up8a3gbeci1q9dvr85el0iqqlb/83888988021.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/69b1e742ca73166d61f2052a22f48a8d/19808162891.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceea16eefb---pafoposakefupo.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1bf7dd07e75b15e7a7bc1bce06eb9b83/87368563400.pdfIn PDF document text
    • https://actorconseil.com/files/file/nusetuwatugovasojupoki.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/sizena.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d65a8b8502f73c0023b9f34fe5eceb75/kenozepizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cook+family+treePDF 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_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 10340 bytes
SHA-256: 4ec6f3a2fb5c3d3e80d6311761c9ec5dacf6f495dc96302f227d39faf02668e1
font_02_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16868 bytes
SHA-256: 6e3d110287e3b74c68b5c8625fd531bda8b9c0378f1142989ac32121168e5e6b