Malicious PDF — malware analysis report

Static analysis result for SHA-256 317dcd6c4d23d634…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 09:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e3d568bfdd836f2c31521570861852c SHA-1: 59a0013be8863860a4e34f008da886a6720dad77 SHA-256: 317dcd6c4d23d634d8b956a9f86ae5b833a73ea29bf5ffd8d2da3a9383d5684f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://philabc.ru/uplcv?utm_term=miners+haven+codes PDF link annotation
    • http://open.ua/uploads/ckeditor/files/29993034580.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/gaxuper.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a5dca900aed9670a0243ba3d7da920d6/ponemofexirejimibuk.pdfIn PDF document text
    • http://kammed.com/userfiles/file/murutudadabironitagelumi.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/vesuxovifuzel.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/xinolenosaredifozuxavexa.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/33182523343.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613271e8c389d---7315715210.pdfIn PDF document text
    • http://vuason.vn/upload/files/81991565287.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/26382066234.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/5928132423.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/daliwexet.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6kef91n1h9e1pvh5bsr27tkld7/migajeguz.pdfIn PDF document text
    • http://amandamaitland.com/images/file/19773854091.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/tivabadenoxitibisaridepul.pdfIn PDF document text
    • http://stisk.com/file/65081519294.pdfIn PDF document text
    • http://dnepropress.net/files/file/12076612890.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/36423164277.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/kabogetakegizefuk.pdfIn PDF document text
    • http://krupongs.com/images/file/wolimevemezajobawapa.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/liputagatipumuzufuxufopul.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/19176688321.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/86025191100.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/97110628068.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/budokujiwojileleza.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eec772061---notomevalajipot.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_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 10384 bytes
SHA-256: 9f58ad0a70a35742e0e50b58080ea21d06b2247bece6a87887974b49d111c228
font_01_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 18356 bytes
SHA-256: ad726926a5b62b4bfe4c5574ec34b8880d09f3dffacd2239b6fc364902429d9c