Malicious PDF — malware analysis report

Static analysis result for SHA-256 69285255e68b710b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-16 18:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51b0739fcdf60be25ab6a6d4a5bf294b SHA-1: 0851d976f801a653e36dd8fe29d61c1592e22d5b SHA-256: 69285255e68b710ba614493fc28bd3a0da4fe2004717f3556fdbec8cec8d8825
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cn-daomeng.com/upload/userfiles/files/19c43005d13ba5655c43d1a1ea75fa7a.pdf In PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/sodupafip.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/zowukezabu.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/61892495325.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210915_CBD8813AE10A8082.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c689607df5---56699536019.pdfIn PDF document text
    • https://music-group-store.com/upload/files/88216216525.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/68624543229.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ab733b0646d2aca9f34a9b0b0521de6a/75923632144.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/bopapefonoroxugogixaleko.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/74879400886.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jujuxezoxikoxoporutis.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/fedonajuradopelemidubofo.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/40332547299.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/limuxugirutuxutifogowuk.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/57482662646.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8b2718620eda1cc30cacd5bc8a379cf1/lezaborinepe.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/delefi.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sokedifutuzavuxorap.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/jixatowegidi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/fowegozepedoxujibotibabas.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/64517260684.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131766d6d6e9---wonelenapekotewofasudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=junior+android+developer+jobsPDF 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_off0000b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 10712 bytes
SHA-256: 583bc79f93ff61abab780453e8f6e392ce9eb33db834ba4ca97e7778388ba77f
font_02_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 16500 bytes
SHA-256: 30b8828a9f21f57793d80173a2c6a4176d29ef50e4cbcd1a51cb5fafabe0ba44

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