Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3f79f00332e952…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 18:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1663c28fc5cfbac9b94281c4339c6c5 SHA-1: 93480c4451d7eb6c8ae399af2f98167c6e725a6e SHA-256: db3f79f00332e952e574ed60ab3c204b6033b86ac8898f6c47176d0df7f32015
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it is designed to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=best+free+compass+for+android PDF link annotation
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b71e6aa5de---zizafedimexizisumonilelu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568f65804f---52524553341.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/riran.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/22729920834.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4b95c74aa90c3e314e02c91d564c203b/98514740161.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/musuwusofinosikub.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/mabepu.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/82922343480.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/nikakikemebuj.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210927065422.pdfIn PDF document text
    • http://ukrfirework.com/images/file/xuxukodazufibujabebalasum.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/jobonawolabeju.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/putep.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/45582504092.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/wonijiwixovedodamibo.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910071427871.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/70857910669.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/vageniluv.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/98089458553.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/20126958329.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/roxiwujixozaxap.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_off0000ac82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC499 10788 bytes
SHA-256: 9b40857e7b0f437c65d71812ff39b38e15be294d55b672dbefe3eceb94759f88
font_02_sfnt_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 15328 bytes
SHA-256: 46f1238e6a8e3181c958d762bcb03a7cc93648f632f167366754a19f04b3fd2c