Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8df7bc8e55a7e6…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 14:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95999437f91943a53564880cfc2f3bb1 SHA-1: b5dfcc8229756d7b81a084302d87646f5a3ca727 SHA-256: cd8df7bc8e55a7e6bb57f59acad43ec943eba655789f5f21d24a1bb4d520660b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=fico+questions+and+answers PDF link annotation
    • https://salvatoredivilio.it/userfiles/file/81007815088.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16110ef4387761---62266150672.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/97072ae4be90fd45d95b67a1b6070281/jajezopid.pdfIn PDF document text
    • https://x-software.cz/data/file/lujaliwi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c853cc84e1d---4186637445.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/wekegakidir.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/sazopepakuwoxoxi.pdfIn PDF document text
    • https://energooptima.hu/upload/File/10254274487.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f67f3a13b04a03d6977078ef9da22164/rawupefodavor.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/mevidedapisuvelununaxad.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/12650923113.pdfIn PDF document text
    • http://progetec.org/userfiles/files/77780496291.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b09fa60f661---zazodomidu.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/jakonufamaripodebixeloke.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210803_CE3D153A9B3EEAF1.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/jebosonakogigijunidoju.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/35396300475.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/vufepujuwabosuzusol.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/wisux.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/7b34uadl0jv7taf6hg5nc6kllv/73878094832.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609fee29a7606---12722379248.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/miforonovobabibidegox.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_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 10628 bytes
SHA-256: d4b04c5c0a1eaaac5151b92945112226e6fe7b8c461f83863c83ab489c685ca2
font_01_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 17872 bytes
SHA-256: 65d2cae55d6ee6bd7bb79a0bb86ba2d77e3d395f2caa261393f35b5dc427c9b0
font_02_sfnt_off00013c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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