Malicious PDF — malware analysis report

Static analysis result for SHA-256 883dcf89ab52aa52…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 19:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 97cadcc9ae2de60a50740489e358f654 SHA-1: bf6ae31147c003119bade9c40b16843427d69a2a SHA-256: 883dcf89ab52aa52a5e98b234118c4210e6e1624965cc980071b4eefab0be3a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage trusted-but-compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://goooinggroup.com/userfiles/files/20210913_055631.pdf In PDF document text
    • https://vinacoma3.vn/userfiles/file/15219627040.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/20968998643.pdfIn PDF document text
    • http://donghotam.com/luutru/files/27929211848.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/xumowijokasefux.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/55640773792.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/59348080603.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/32648731268.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4dp659gok9e0lj70jdosmml9jq/76237908446.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/rupiwobotidokufozavifasam.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/97699449715.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/15640811233.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/47281366426.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/nimuvabapoma.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/74434427362.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e46c8852---wazafeforenig.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/gefekupuneso.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/bifiw.pdfIn PDF document text
    • https://mahae.hu/files/files/vodejaloxizumono.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/82024941008.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911092449.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210921175006714135.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/dajuka.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/jadawixuzus.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161429150192f7---sovowosagapunosoxisezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=top+10+best+mobile+gamePDF link annotation
    • 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_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 17860 bytes
SHA-256: 6c677fb6f3fc67d74170684ed5f8b4f4772797411c09126249e4084b509e3f04
font_02_sfnt_off00012c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2D 10668 bytes
SHA-256: a196a85613c0b90417c7cf6290061d5614cbcad9a3c1f006a061346cb1847bd1

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