Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6b6f402d8d4361…

MALICIOUS

PDF

112.5 KB Created: 2021-09-16 16:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38efbddcff26a0ccf7d000691bb1b818 SHA-1: 9b1ea9556b16f3199651134e46fc72871f57b278 SHA-256: 5c6b6f402d8d4361c6921af7a44f1caa6dcb93aa9112f9d7b59b9b383f03532d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, likely intended to lure users to phishing sites or download further malware. The presence of embedded JavaScript further supports the execution of malicious actions within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 https://oniceh.ru/uplcv?utm_term=darwin%27s+game+light+novel+pdf PDF link annotation
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13865585837.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/juruvipubovixokaliwuxu.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/34193772214.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbe2c0617---42327844416.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a082e6f3ed47bdb0123c737e6d279136/86329533292.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/kivubipiwiwewewetavebimo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5d672278eafea2cbd9df6eac5b655a69/saredisaman.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/wopuxuzid.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/ragopatutapadowalel.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/luditakuli.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/golijejunuraderatevusalis.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/xitunizirixo.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/55334280982.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/17211534743.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e65e691e---73828171330.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/44634039121.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/sogidavadakatadaj.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/29961780954.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/manusutuzedeb.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/82263062044.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/wajiwoposawi.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off000126b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC7 16836 bytes
SHA-256: 1bbddc0b8385c68cbd4bb1de93a0da7ef3ddb5d7f6785d3208d5fcded01b912d
font_03_sfnt_off0001570c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570C 11132 bytes
SHA-256: 2f2236f32dec13ec18bf21920a41088dc0a39cc0722e99805290c82b98410215
font_04_sfnt_off000170aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170AA 26044 bytes
SHA-256: c63eeb8b25673d55932cc1b8baf84724cca4bcd6e596d9d0a8660f9cf74050fb

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