Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42918288ee24980…

MALICIOUS

PDF

67.9 KB Created: 2021-09-12 05:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7ce5ea00058344c10de183d5bc0036ce SHA-1: 6ea6e056c8e2c63b7f45c7a3ba471ac7564e2567 SHA-256: f42918288ee24980b2272bf8fd9ff71c34f904fa13e1abe47809ee9d3bee9c27
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is structured as an image-only document with an action trigger, a common technique for phishing lures. It directs users to multiple external URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to download further malicious content or redirect to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=definition+of+curriculum+content PDF link annotation
    • http://briztravel.com/upload/files/85051493376.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210909_9CCEE5DAC5B5F487.pdfIn PDF document text
    • http://shahgrp.com/uploads/nimowumalazef.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/77c96a12dc01b268911cfa5e6b8b05d1/volubamezad.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/tokelusewuzakubaxoxo.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/79479926346.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/sekejupaxodisuvetuli.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa0649ff4e---soxodolusezezanawonawisij.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613168b4910ec---96664647249.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/52294605070.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/061602167921.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/kukejapu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624a5e3677---77851238192.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/43741066735.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/basobomewakux.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/vorefikenaxakuja.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/87490581999.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/11181043431.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/zeluzoxokifadufavusi.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/rosusomow.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/losixawavizekus.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/42843423397.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/titebifejanefe.pdfIn PDF document text
    • https://digicpictures.com/downloads/tamivemokidukufu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371dba59eb3---39387075914.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_off0000afd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD4 14228 bytes
SHA-256: 63567abc27a3fceff28efe97650b4981d62fb9782cabc93a571be6e4e11051de
font_01_sfnt_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 10268 bytes
SHA-256: cfceebaed9d582ccb1a895587e8108255f6f29700c38a43c2184e6dc8c619629
font_02_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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