Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4fe28e4f1731d9…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 17:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 937ae360e12ca34b6909ce9dd271ace8 SHA-1: 22a9f215697dc6b8e44481ed87f0f3decf5cf18e SHA-256: 7e4fe28e4f1731d909dc4caf586ec0759c80c38013f94d57bf68288f86d94aa3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, including links to compromised WordPress uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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=employee+benefits+journal+pdf PDF link annotation
    • http://x04ydivan.ru/userfiles/file/11807136241.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210707023250_lnmttt.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/12890377509.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b3ca0021---jeluriwejulivujele.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607594c32ea1c---lanegurogejadi.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/87935115521.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/megemituwa.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c078368e863---nukelosapenudibixi.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c67e53e835c---41783946229.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/kusoretawopamu.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/vadolatapogavetafagugek.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/815394003.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/31767191329.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608028f09053f---70436596448.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/vobakigekemawonumo.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/fokutigogekarotul.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/43476960822.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16099e74137894---pobalufu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7827242c23403cef064e6f60c3e4d0e4/miraposovijip.pdfIn PDF document text
    • http://word.mn/uploads/assets/58152044009.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096341573cbf---lexilajomijinij.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/r9af54a7knusl39gam2j4oafr1/93915584442.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5aa26acfe3fd0112a7138e184b182a84/setodafux.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_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 11128 bytes
SHA-256: 33c20a1d5e0107826d5f35152330e18d5b635cf7083f5cba1d6e5bfbbbd36551
font_01_sfnt_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 17192 bytes
SHA-256: 308593f9dc70c56a38f036cef32ff019b1f9a77383348f17c2e850790a424923

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