Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f62bcc9058a9420…

MALICIOUS

PDF

90.0 KB Created: 2021-10-10 02:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 91f0bea78d99345049b9d796c9bfb759 SHA-1: 9548a93eacc0f8ebcc3eed96cbe3756a38b4e015 SHA-256: 5f62bcc9058a942056d371e35cda3edd1cb4f1b9edb903fa0db19f3424cd3ac2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=the+thieves+den PDF link annotation
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6uegifqvdnl5nl2spm894plgb2/55191813073.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/nubononejoverokesevebunir.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155cd7539ed9---lorufemojidutowisir.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/xetafiwu.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/68076573849.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/58813981308.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aebe0de24---tirodisosiwuguwatuxud.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/jelananol.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/durezovewirewuvaka.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/76303442048.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/61791649300.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/zawala.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/95342392329.pdfIn PDF document text
    • http://tenis-klubmoj.si/uporabnik/file/95054808922.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/xabadezelukerotupo.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/vobokiwe.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/19171294667.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/14489034222.pdfIn PDF document text
    • https://diagoldjewels.com/userfiles/file/jilubumukisuwut.pdfIn PDF document text
    • http://videlec.be/ressource/file/zanuwazonetajag.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f9aqe3iafr0hsj4ev09a3qf9s6/31627437322.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/laxujelajogavu.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/rasukebuxal.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/67906014304.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_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 9944 bytes
SHA-256: 60f82f70292e5c0233c50b8611848b6f2313ec05afa5eac78b7c80f08c3b5b44
font_01_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 20444 bytes
SHA-256: 2fd1fcf0cd5c9c780dfae7977001c3627b06d8dee443323aa360bd64312d1451
font_02_sfnt_off00014297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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