Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5231f1d76e230e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 03:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58900a69ceb60d0d37203fff5881770b SHA-1: 5d292128ec243fecb43c51eed849ff32de282ba7 SHA-256: bd5231f1d76e230eb76295f24c0d018c69a19637e2b838a5e302b422245c951f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pistant.ru/uplcv?utm_term=pubg+lite+lag+fix+apk PDF link annotation
    • https://farmacieitaliane.com/documenti/file/46228377282.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/vakubo.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/gatureg.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vikumutimimusepa.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/wewidididigawa.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/78540245430.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/xomivulajamutuluwux.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/98719293427.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/727184033a1d005e96b11a856f96d64a/kawigedirusabupepifav.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/92975571095.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0gamgon2s9mbqn4u641kfeltbj/73182790210.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/71339169213.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/vosesemolevukanonogule.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/kimade.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/vimudukozuguditu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c04595014c8d62eef542c8ac3fd26008/17246710671.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/7515297456.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/94695575769.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16140de1bb1c6b---66045552032.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/95480120207.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/zaxaripotezulekanumokasap.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/xomopajeturumaruxazu.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/26293445279.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/19825001939.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/57673339061.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_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 20292 bytes
SHA-256: 1c8af21154c27b1c9f19fcc343878a8fe2b1430fd6157ebf368c9da5a02c1f88
font_01_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 10476 bytes
SHA-256: 0e8945f7b1967e0ad5fa7575899941aa4a7f6cd3258de505683a52ac490b8b3f
font_02_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1