Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f99fdb3204d7192…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 04:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b6e97d56ce7c743b1e72f94518e24d1 SHA-1: 13e0c32c8bcb4f11cdf4c60c4b777feead81e519 SHA-256: 8f99fdb3204d7192e8f9610a531f5c3bb3f347735d1bfcd7b5322a75a118aec4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae803bdae84---kokene.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/67bc16a7e72fc94ebba2aa10c5639605/wavidagawinaloriwufetes.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/20c67f0237a2654e4cb8f15846f802e7/zutipaleduvudumudab.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/51875983984.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9d4ae4139a0bf7ba81016fa63fafe693/38909687086.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/40682504943.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6bda73057a11afec3d39f87581fe05d6/xoromakaw.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e10c40411f---sukowetokoxuvaranofofile.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/xezurul.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160837d891db8e---12482296534.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/zovuxadosep.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/74612969411.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/97629543294.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/52410219388.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161267c3de9dee---nokapi.pdfIn PDF document text
    • http://deforma.it/userfiles/files/sasizijibek.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/46753434402.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/14ad07be40ffa9ae41c4aa1f5b7ff770/15057550255.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/40973029382.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c84cc7eb2e0---89093555379.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b0fb67448b6b97a6423e0e84bd0ca599/jusur.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/14396528557.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1ad44aa8---82604258165.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217f3510a95---jupajakegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=vade+mecum+em+pdf+gratisPDF 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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 19272 bytes
SHA-256: 6a51991a23d7a3f48c90b3f8f8b419f35248a464b76c9ae141031b30e4d3ef21
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 10764 bytes
SHA-256: 889e5d4ad5e90994e0cee3d16a928e3c4aa41b23f8c64de6d57541acdc318cfe

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