Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8a841c780f6603…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 22:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78c9d010f3353de4e000fc4e9b5c9c66 SHA-1: bdb4fe176705302e2e73f4bdae6fbd54aed7e404 SHA-256: 3c8a841c780f66030b303999f8b73e475ae4a888ded3530f681d9c7c94436b7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://chcial.ru/uplcv?utm_term=how+to+run+android+app+in+windows+10 PDF link annotation
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8f820279f1ac5bc3d95dd41208c51650/7399366885.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/lumesi.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/jevuwudopusuxidifet.pdfIn PDF document text
    • https://premiersuli.hu/files/files/repawotiji.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/33406925595.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/51925292656.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/38833844532.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/sulurikuzizanefujoj.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/54953467135.pdfIn PDF document text
    • http://hingliltd.com/userfiles/87372164320.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/busifaw.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210917211434.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/06vkha3qvv0elom3d32hi27a3l/gopokokozexefipofow.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_7867D9CEEF9C5F94.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2efqk02hprs8tqo43baikgrjfr/11977433005.pdfIn PDF document text
    • http://abwrva.com/uploads/files/88886570832.pdfIn PDF document text
    • http://btfa.tw/upload/files/39173278786.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/23323380374.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/58580135595.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/27219559702.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/16868972477.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135694838e06---47690273639.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b25c99a8e---34052961218.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/gizodi.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_off0000c502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC502 16932 bytes
SHA-256: a780d432c0c64240505251e8cfe2ddf4adcfa6631657d177de1fbd7d0e781e34
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 10560 bytes
SHA-256: 563636978bbdcc070eb0964b9db4b16ae159d49b054fab279c0d865c53495b1e
font_02_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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