Malicious PDF — malware analysis report

Static analysis result for SHA-256 720b20ff0874cc8f…

MALICIOUS

PDF

88.4 KB Created: 2021-09-05 18:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1c68f85b0d35cdae52ea186e9812185 SHA-1: 910cd4106ba823543d485938b8520007b9eb5b7f SHA-256: 720b20ff0874cc8fb4171f541c548918ad58f2cbb85d9f9a40475cd9392a9063
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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 http://otvorene-srdce.sk/userfiles/file/41476067740.pdf In PDF document text
    • http://penzionklara.cz/userfiles/file/29951717837.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/81285854760.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210722_FA630D65BBF63099.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/34175953262.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/76531186737.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096fbed7da99---38445270099.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/3845924467.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/vaxak.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/tusugoragime.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099808fbb991---85908400321.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f896a10f3fa293a0cedbcb1d0d65a41e/24647996058.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4cf743e1f---810347527.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095ca1762c0b---28708089152.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6882f934---bobudipirotiz.pdfIn PDF document text
    • http://msiutilities.biz/documents/19344820401.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/duwazamigawakufizujuwa.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/cbae08c8047cee4bb236b9103a3c8e8f/rotixutobix.pdfIn PDF document text
    • https://hongmao.tw/uploads//files/202108061016143867.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/903730e16f8f7c123136a31b73fe6358/91365021633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=regents+chemistry+lab+manualPDF 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_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 10956 bytes
SHA-256: f1399b6a96404c9b5707ef14e0f1991c0247e7c56a39178e27084bea79fb4077
font_01_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 17876 bytes
SHA-256: 8f5577edfcd82678b7baaec626b7bc2f0d3a0120dcaccf9535e960a3f5820acf

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