Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb569dfa876f34e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 02:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31038d09e54bd0afb8bfc2a791671222 SHA-1: 0ba37f684f047272ae32b73eec9d2657293fdcc6 SHA-256: 5cb569dfa876f34ebee77632b373645f44f559e7aa633549fd7e14ad03e25c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, often with UTM parameters, suggesting an attempt to manipulate search engine results or distribute malicious links. While no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=moon+live+wallpaper+hd PDF link annotation
    • http://kraemer-duennebacke.de/files/file/novirogategadavaru.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/71981944977.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/765442176.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/tamogogetixokabegozo.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/newinipekupelulena.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/49542818672.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/69422914367.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314b1697725---datajagizuvatajave.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/28052631468.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8996aed2dd4a623efcb3902ac856ae39/volamamidipisetopuxotug.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/94019602393.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/55635736189.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161451b9581ead---wepubo.pdfIn PDF document text
    • http://seamacros.com/upload/file/botamix.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133550cb92f7---50874601265.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/575htr8a1oaco6v3pq93r5m057/98342972537.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/posewofividat.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/loludozizosabutonasuwi.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/51810570503.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/30227116408.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_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 10368 bytes
SHA-256: 4a2958288341467bca2ccdbd76efc5c0a47e15ccd33b03679dbe9d5c57c25e5f
font_01_sfnt_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 17336 bytes
SHA-256: 28507d38bc9a715f6eabfc6fbb07aa076e2225ba257ab63023fdeb6707bc88fd
font_02_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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