Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4d1b282f646d04…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 13:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eff36d9faacfde1909423ab4f8301645 SHA-1: 6a166dd4443de579cff539a6a6498195fd43d141 SHA-256: 5f4d1b282f646d049b1c379142ae295328c58139d98a7d26e2a1fd47ef27b912
204 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress upload directories and disposable domains, suggesting an attempt to host and distribute further malicious content. The primary goal appears to be directing users to download additional malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=ragnarok+online+android PDF link annotation
    • http://regalmotors-jp.com/js/upload/files/8027527656.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/kawibi.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/75893063463.pdfIn PDF document text
    • http://lobi.md/userfiles/file/56171735417.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/fatekageto.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/576275519.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/95416040586.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a766e4b1---33740364988.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/49265298697.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/26440242668.pdfIn PDF document text
    • http://cecev.com/stockages/files/kipimulexopebawozumaj.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/zusepopanoralemebivuvuse.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/63565930675.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/fadozuzekogakavix.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/wuwufumevuwemima.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146004fd3de5---buvojemaki.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/fukexiruxu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4464dbe26c9753dfced1ee88c6a2253f/80391025313.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109090636313645.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/42252931902.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/jaguzubofiwa.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/jibaboneferufujub.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210919064803.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c47d07f58e491386f31ac71e01498ea1/japawuz.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/25801937252.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/falukig.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/73539654848.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/bugokifidolemedoga.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_off0000b9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F1 10292 bytes
SHA-256: ca3fe3b07486e6a2cbba1eca7ecd6ea1ceddea81f948790f4915a3547bdc4c8f
font_01_sfnt_off0000d0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 18064 bytes
SHA-256: 227857ad380b5ccdff71f479f2a9ec9c6256e1e7540df6f579295727359eaa2c

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