Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e670b439b5bb49…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 05:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 47bc0909f2d4d9cecc5422f5167a4922 SHA-1: 8c4f3b70775ad137dd0a8c658bdb87768d5839ca SHA-256: 86e670b439b5bb49a678d8018e6b5d97267ae8b916e857905cf5a85f1949086d
236 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update. It contains numerous links to external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a distribution network for malicious content. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a dropper or facilitates further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=download+kitab+kuning+makna+jawa+pdf PDF link annotation
    • http://mths1965.com/clients/6/62/626de2090e8268457c7577d5e8b87900/File/40223972486.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/60663433725.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/43506155873.pdfIn PDF document text
    • https://afayl.com/userfiles/file/kidilemimi.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/cbb4efed4b0b6bdc419f52de95418fc7/89289822434.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdd0048ff---48112912828.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/54883673036.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xogetabilewifofufejerogof.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4c7ec53451d2cd3ce70152fc3acc5030/lujuji.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b635de1ad---kimanuvedegiruri.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/84653029952.pdfIn PDF document text
    • https://akemi.ro/hirek/file/rozazapasibarulikukoxox.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4tpf6r01pr17b5l5nd94loks70/mavumezojolowules.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/legapovinawewizovuzif.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/88588569230.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b19b0d0b9---96907612434.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/77949199774.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/gadolitejoge.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/44172743207.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1610f91db4f121---72841299223.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef1912a8a---19943603104.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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 17232 bytes
SHA-256: 215863ee024a46072f713ecd737fb6e2aa5f5d8cd6dc69fe5d2e239e75fe3f9e
font_01_sfnt_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 10988 bytes
SHA-256: 475e85032bc30d230e45998320f6fc18c0742417f58bc02baa6189b1ffd33df8

Open this report in the interactive analyzer, or submit your own file for analysis.