Malicious PDF — malware analysis report

Static analysis result for SHA-256 5218400731a8690e…

MALICIOUS

PDF

92.2 KB Created: 2021-07-26 01:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 264f1127776fdebfbcf991c9ad5cf9dc SHA-1: 10f4611d1abed69581bb8db7fad4cc413adf8194 SHA-256: 5218400731a8690ed4be85f5d1aadccb0da838b81f407dd32edde2caf3d4ff93
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://assessmentinsight.com/ckfinder/userfiles/files/legowuzenudizufesev.pdf In PDF document text
    • https://gelblighting.com/userfiles/files/rotibelukolun.pdfIn PDF document text
    • https://susta.vn/userfiles/file/65670533848.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210621/1604478269.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e11ea665---wakuxesoregesanovowazeg.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/zujurawaxikazekab.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607117f4af51d---givipud.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/dinuzezomojoloz.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4cf6e970---dakidesijobixamanixaxidab.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/3ea13bbb86c7234a56a139c8a717af3e/43255847680.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/739d9617829b796e8deab6c27ff22715/81355549073.pdfIn PDF document text
    • https://tmtteks.com/files/26890931737.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f74d29e71be014e740fbb2132e5fe2db/godikuxo.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/7721356699.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/40299032583.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/86e1efb1f14c699464818df8e166116a/jupeliwikaxajeduwajanero.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f3e27935---sevuwobexet.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/gexibalurexotukugibejot.pdfIn PDF document text
    • http://talleresjpg.es/img/file/37881706444.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e5934ae3d---mibipitanepifigokawanad.pdfIn PDF document text
    • http://midel.me/userfiles/file/ruvivulezuzagegidevov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=naming+ws+%233+ionic+compounds+with+transition+metals+answersPDF 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_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 18016 bytes
SHA-256: de9ee0cec3990622d8538d9732b9dc94f4f0deea788f4c04035a2bd4f29a335b
font_02_sfnt_off00014d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5E 10020 bytes
SHA-256: ae6980929c4f3ed884c95e5bdfb6916ffe2d96ad64a9f5954c4c65b9d23d264c

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