Malicious PDF — malware analysis report

Static analysis result for SHA-256 6172e92e8b265d40…

MALICIOUS

PDF

70.6 KB Created: 2021-09-04 14:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f14cf5fb991e0129349cf005ddea7bb SHA-1: 8f05bb73174c7f075c24c11765c60dcda15b6017 SHA-256: 6172e92e8b265d40354f7a57d62f532628477ab57fac0ee89d32843fea8b9feb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristic firings strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://oniceh.ru/uplcv?utm_term=rate+of+manual+microscopic+examination+of+urine+sediment PDF link annotation
    • https://zanhotel.ro/beficientconsultingFiles/file/18933017477.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1e14c57fd8c6c5d9f2ba2690faf97e59/xavobugawe.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/75596060089.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/lelelederidetebej.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080da4603759---32430042271.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/68d7901abbffe3f7a02a24167b033f54/widiberagi.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f7e3271f5c72a098954d7cf2eec920aa/75198098204.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/lewinofaxujaripudatoji.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/62931715650.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7a86a36bb569487a4788ee7c03ce8048/98411478651.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/gimezemonitolomelula.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/97174642055.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/jasubumunofabexafiv.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210829035317.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/66c6abc427e4b9c11840e02dc3a3fae2/39736843427.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f973897b9---60853501956.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/6488664101.pdfIn PDF document text
    • http://packamate.com/userfiles/xoxaxisuke.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/dobusivegapabusej.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/naretevatadozuxe.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3e9e98206657b5b1545ef5c794c92647/58039123047.pdfIn PDF document text
    • https://inncredel.com/uploads/zexinapetiranazob.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/forenogasigexujud.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_off0000b422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB422 15240 bytes
SHA-256: d963cd1f68d5ecb27449b5953bd3a066c3885d77aab13a293da5aeed5cb433ef
font_01_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 11028 bytes
SHA-256: c130a4cfe3fddd302f1c8652b60c6125821218a1d97053ef427a017e894c5937
font_02_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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