Malicious PDF — malware analysis report

Static analysis result for SHA-256 77726724b342f3c6…

MALICIOUS

PDF

98.3 KB Created: 2021-07-26 07:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36881c238bcb723212a85818052e8269 SHA-1: 2826377c83e49d4ef5cdd16d32b3039d4f450f9f SHA-256: 77726724b342f3c6f0489fec54591c8d0fc57b13081bd6ba8e97cc0e2e6215ca
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The embedded links serve as the primary attack vector, directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://asijskepotraviny.cz/files/file/66765549820.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607800e5bdfa2---kituwoxuwixejonasakure.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/sutuzun.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/8711614615.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c540ca01099---46363687228.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075b40fd74c6---34713694274.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/47505120475.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/tenazope.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ts6fuvl4ne0b8cn0g6uo7ase2/68768926245.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e90b7a8e28---biluzegobevipafa.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/balag.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f58f486e47e7d1f680946e15a30f61c9/zisemoruvazedobotujutibep.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/59838504d88146d9393b13176824f635/wakuvirasedikokizorad.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/91338025839.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02345be8d4---34077886467.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/25432300713.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a87fff2a5b2---52111396651.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7d12934c5b0a559db5aa84ca55a86427/80247983258.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/bde6a80309ba8e5e56ab31f643d1e9bc/tonolagalopafijakudinefum.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/21mah0ha3qb7hq7pedp5ka28q3/79992579522.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f5fc2b651---42590749215.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ju83bnrmor1oajp4e5io169v23/fajasowaxidasixuruwukinu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-2/20210702045441865675.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf045b77d360a0d0a1225a91a28db660/74690602285.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095549fd3c55---78158130177.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/96099884485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=stick+war+legacy+mod+apk+download+iosPDF 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_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13561 11224 bytes
SHA-256: 68614fcfad3e088dfdc36c861362302dffb2944500b8c2d4f09d4299f356d7f4
font_02_sfnt_off00014f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7F 16848 bytes
SHA-256: 54abd6e7fe6f7561c1b1e6418da67f33212dd788367cf8aca30125f82d441233

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