Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fe5286c7401a46…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 07:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e67061674f326f2c0b3f86880d75b90 SHA-1: fd6713b935c9ddadeca30030689f8c1385d13589 SHA-256: a4fe5286c7401a469ec91f9cb02b67d189a8b8d1acb2c81df61d3fca376d130e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and multiple external URLs, some hosted on compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document actively tries to prompt the user to execute commands, a common technique for downloading and running further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+to+set+static+ip+address+windows+10 PDF link annotation
    • http://ecolservizinettuno.com/userfiles/files/87646824222.pdfIn PDF document text
    • http://short-story.ru/upload/file/16083411940.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135372c3c47f---budivagizopajomububififa.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/15586957392.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/wisofikoworajajiw.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/63691241892.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/38728780507.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/topavuzutanof.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/666b80a3a9229ec8a6509aff78d69f74/52910744486.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/1433182808.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/24932926812.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/91715940126.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/39423783901.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a7982ea4d571ea9846fc82f2b61ce343/32013442408.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xuwunikepewirafe.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/vefemivajoxo.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/39287575999.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/nejipevajuruwewejukanize.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/kizotuvaxemu.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/dapamabawajakin.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/62281466322.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/2983220817.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/pakogurubalelex.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613238ccdfdac---dafarupudimelisem.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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 16868 bytes
SHA-256: 98118cecaf342f5b6a5234ced4dc25f373843faae0e81aa8512880519f41f3c6
font_02_sfnt_off0001235e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235E 10712 bytes
SHA-256: 8ccf889f18bb22a042ac9550d0ea40ae1b092d3bd5b9c1e7ad30772074e9711a

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