Malicious PDF — malware analysis report

Static analysis result for SHA-256 756e9f8c64e63592…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 20:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 98adc8600c6633dfd83542317d3916dc SHA-1: 4957a502e109fba65de51f383cb0830a0039636b SHA-256: 756e9f8c64e635921c5f5d6113fffe4857df9d99f2616fdf8c86e4cd76440f73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=connectors+in+french+pdf PDF link annotation
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/sj46h0jg86eht0pmafvk4ucjmf/goxewuj.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/28029457897.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/92962182887.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49daa834cf---resoropugerepesawute.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/tiwedudeniwigowu.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/25408189617.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608117e2dc703---57217265864.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/kimirukudipigotabal.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/gemelawajotepubefu.pdfIn PDF document text
    • http://splogservice.ru/content/files/tegokuboj.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ad4fd001670cce9f112b5663e86ce52a/nejubefifakixajo.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/14685868930.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/45455204047.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d7d062aa4d782a1693eb92a1ee505376/95034316983.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108121321134672.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161257754600f7---verusuvus.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/fosifewelebetepefamawib.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/devimagotisaxopulikexiwa.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608b350e62e0c---17441476664.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/2eb31b019ac33be7d9ac39d006b25f8b/23227072696.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/tokigexajivoxebagijidewi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/dezapawuliboraxez.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5286a67701f7eb0a542e34da8487a1ab/66833318866.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/bopimemuxemovawizubagu.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_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 10540 bytes
SHA-256: 8908f028c85b4313f97c7cede12132323e7e4cbc34c0546477f6ec388b07f636
font_01_sfnt_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 17836 bytes
SHA-256: 188936a81212bf0baef78537c5457c071fb6a6921a78e7734b4c0bffdf817ca5
font_02_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1