Malicious PDF — malware analysis report

Static analysis result for SHA-256 156d64192fbb56f2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 17:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: ed4580a9b09ace223fc3f12ff459b1c3 SHA-1: 77edab067f5bfd3fc90967cdadb05ff9dfef7491 SHA-256: 156d64192fbb56f2f9065b349a9a5f5b2454b8b1fe90204140b47e77c0258065
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware delivery vehicle. No specific script content was readable, but the overall structure points to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=whole30+calendar+pdf PDF link annotation
    • https://atputasbazes.lv/images/userfiles/files/mofafefetumewidof.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/98033741199.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/q1ga7au50m5fpl9qtunp38v3cr/kolosesovufagonolijofomi.pdfIn PDF document text
    • https://huanghecables.com/d/files/zamilenez.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/66h34so2s67ht3tu0ofaetervu/74099103756.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/40323931887.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/89468530801.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/deromoruxilolu.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/zusizilivevefodanilafowo.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/padedozopixiduzotibozukud.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/sesuraxete.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/lovixu.pdfIn PDF document text
    • https://cncunse.com/d/files/33209150622.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/71295bee9301c07351b222214510632a/66964489861.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/2349433324.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/nakuxorenarafajede.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/59080633637.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/30141089428.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210905175028_590845920.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2235aa2c513b3057e050d3970046994f/mugukiburezobasovuden.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/raranuzigimibo.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/terijadom.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210920094823.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/80299590672.pdfIn PDF document text
    • http://medrea.ru/upload/files/kukorimirezawolipu.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://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_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 17996 bytes
SHA-256: 8bc19adf94657db89fbb03764bd2fc64e564b8eb7319fa35935aaaa54cf45d5a
font_01_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 10648 bytes
SHA-256: edb725afd934a5043837ad4033f42a46ea041e9bba0183f2397284d5e723f75a
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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