Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb999d82dc8fe92…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 22:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 012ffe796d1f8e9558a2c5a442065611 SHA-1: 8c535a8c6d39802a156bc4ca9cf4d3c76920bf75 SHA-256: 2fb999d82dc8fe92b942b80f8a243ef3b0fd7809f84097c1f7397d2f5a45bfa1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, such as the one found in the document body, which are part of a link farm designed to obscure the final destination. This pattern is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=modded+bitlife+apk PDF link annotation
    • http://caythuocdangian.net/images/files/kunatavilivida.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/56703b29975ebd21613e6167958c3037/44623397747.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/1599785817.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/bobosidalokuzazalaxosetig.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/40luml1kejb8m54ho9e6mfja8d/66539762907.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/87796570925.pdfIn PDF document text
    • https://breedlife.com/upload/files/88694988955.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/79908337877.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/91840926954.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/futuw.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109020243399726.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c8485a99c3bd2c5990a905d843143c9b/lokan.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/28631721438.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/90630076843.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/2162477618.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/23565856318.pdfIn PDF document text
    • http://888chji.com/userfiles/files/73393522189.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/vonexuxupiwesevusumatage.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/39032255916.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/siruguzi.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/zokafi.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_off0000b7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 10344 bytes
SHA-256: 191f32cee4493820d10bdf65f95ea8464c4e43a25fafc79f801b8c0256e40fd2
font_02_sfnt_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 16368 bytes
SHA-256: 159a7d3180a9b3fa5faf4c0538864cadc59d330e0db94dca4426f8b8287f85e3