Malicious PDF — malware analysis report

Static analysis result for SHA-256 1920e824bdf0a277…

MALICIOUS

PDF

83.4 KB Created: 2021-06-27 23:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 556e6881879ed33f5032a86d9e993bd3 SHA-1: bda6a3df2737a58824bfad201dc66c346b3ba6c9 SHA-256: 1920e824bdf0a2774103d3f6c65f18cc5065264e4d13a0ba4d3a7f7eae2ea6d5
176 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://crysiq.ru/uplcv?utm_term=discover+english+1+test+book+pdf PDF link annotation
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072593bde53f---dazusuwo.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/fiwenufu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a400b9f1101---niwipem.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/28151115232.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/8fb31fa1633a2890cec37d87c0dad279/pobiwiwufami.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/79246956087.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/xiwepotonaz.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/45513578878.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/kakokujanilamabiwad.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/164c840ed1aeb13b23f4757ba9f8eb2c/gubuxuwipokudo.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/dukuxapokevudukizu.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/nimibegodajufozesujoda.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/meparoxekom.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/89e41ef1a73c6f801abc948b997a0967/76949689476.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/6beeb22a6b6f14c5e8f0363380889308/tusuxewup.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079e7adbd732---luveturur.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a34cec04810190de3d755cef4b7ad6b0/51328596960.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa01a39ed01---nufozibisorenim.pdfIn PDF document text
    • https://kaisar168.com/contents//files/kozunijeduxunozenubozin.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/60765974446.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/82753718672.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/nilojadesejesu.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_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 11088 bytes
SHA-256: cd58923145667d91e675b1689a5649a6aace8c3ca2e68c3b23b14d72c5146dcf
font_01_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 28888 bytes
SHA-256: aa2a9fca83d5185b00c7721887f4b93def0db514a494f29e9374f5b89cae1b4f
font_02_sfnt_off000126ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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