Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f195bdbd694e02…

MALICIOUS

PDF

71.7 KB Created: 2021-09-02 19:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b1f26c4fec1de1e12f686628deb0664 SHA-1: 567a826d62ed6937ca58a72b8d6dd13b39efc400 SHA-256: 50f195bdbd694e024ff6e4c9e0f88771beb7b55a1f3b866841243c968a13658f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • 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://griswoldremgmt.com/uploads/files/5532412809.pdf In PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/18226841876.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/4102379508.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/kaxide.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/25957762840.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/u6kvo4r5fauu69gl90mnhl94f4/33213789655.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/7196772468.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/v6fgijap8lqj72v41cfercmpl5/zevidikuseg.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfef0821d5d---7405595923.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gukoxuxow.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1n4brk9h4oalsgu7glbk7bu5u5/wugikitudomija.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/rsf8492b54j50r64e61092pfjl/9713458649.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/11454369923.pdfIn PDF document text
    • http://vucert.vn/uploads/files/tosulamenik.pdfIn PDF document text
    • https://siroyensao.com/upload/files/87828218143.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/pe48f699okbneivd2c484bnm9t/26251852885.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6bd951ce134a83c54b27e3c68606c92c/xomadorofewuzadojamefu.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hps23r92shparu9mvar2ld1lko/pidelugojo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0a4e37a3e9c45674ff17912f85eaf8df/nabubupatokalavejupamoj.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/32553982832.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ft2b9vk7rt614tk2hhpqt4a9m7/27743346412.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3689ba25a2---fobixemugadenekoj.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/qm2iqj8lg2l5a8otea8b3a0nba/93457963431.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf53485df8---vidizugowuxaruwadedoloxe.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/xesipum.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/wuropufovegivizefotuf.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/xoworopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sidney+sheldon+bangla+onubad+pdf+free+downloadPDF 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_off0000b7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E5 11196 bytes
SHA-256: c4798fba01f5689c00ca58032e66dbd958af989e32af0930cb9bbe2c65ba88b4
font_01_sfnt_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 15288 bytes
SHA-256: 2b12119796edba04617a7400d36792559b8d5664343f2e87e6131c9fddb217d4
font_02_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1