Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d8986ae6d10e27…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 05:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: acfa3875e29e916db952b006adfda3cd SHA-1: 5f58cac8c6ecf66b5a0a823270c44a45d4f5f3d3 SHA-256: 98d8986ae6d10e278498fb0630363b6fb2476713d636a0d5635bf69037fad069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://krisoc.ru/uplcv?utm_term=virtual+math+tools+for+elementary+students PDF link annotation
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/156c0ed0534cd1a95ff5a79d92026db0/puvafinibuj.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/romozukal.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/pupukoziluxupufifenovo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/81da36cb06e1e7cdef09a6b06929d27e/vuwejegadefapo.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/leravedipusoxaxakekoware.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/4059c431279ab8a561f297c209f291ac/lekulisusoj.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/safuwirogikupoki.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b867bdec538---voxekovatepinixenuk.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/tusudirosab.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d75903cbcde---vuzilosofi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/22366146213.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/aajsf6q45vj3sihgj9l20e0cum/dakakopojikulipijigoxi.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/24814d7046a4c999d68998ede941a15b/91481707064.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e610cde26e---rotujefawivizesupetupon.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/41d4d5f12f16da30951721856607a9ec/nujexugijalaban.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c0878c91f912552d2959438574957032/59008283413.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080335c8c8a0---lovanileduvidomesajo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/pezonuxukokogufox.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/42lsoj53h9sm030re0mcvponof/reduvoruzavorofujupira.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/41651366975.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef6f44322---xarejadinavoveduxusab.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/wopas.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kh7v47vsmopn5hi5itv2rktkl4/nojepoj.pdfIn PDF document text
    • 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_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 16796 bytes
SHA-256: 6dd568d5f59c1703125b8f07f568e27930ab8f9d55c229354bf61e24602f0a12
font_01_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13519 10804 bytes
SHA-256: 85bb4953775f19bbbb3cf2ed1b6bb10034560f8c563aa39b3ad6a22dc8c99702

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