Malicious PDF — malware analysis report

Static analysis result for SHA-256 d234983db58e3669…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 18:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a571f5b9ee2a12adf491b60c5e8efae SHA-1: 2e9b6f430c84e4dd554f4e1f6f5b3b12890f60c5 SHA-256: d234983db58e3669c3415b891d7e4ba41998bb10a7b65d3c3138c844cb9a3833
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to manipulate search engine results or redirect users to malicious content. The embedded JavaScript and the nature of the URLs suggest an attempt to download and execute further malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=zealot+b20+manual PDF link annotation
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ec3a6f74---kepegowulud.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/movukegamunizafamepopid.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/13277236189.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a2dc4a21b97f3827a8cc3aa2d79b902a/5684594633.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/53009069017.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/75382677267.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/30840718856.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/44436225886.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ab1b539c0ba859da0c49a27bd955cab3/20414090500.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/88273577141.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/gitasaxalitogikegevegepe.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/21926557532.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/08/52743604686.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ca57e86e201d24d29db4c8d8a6064430/mapebetuji.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210908133848.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/23225763774.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/96588673617.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/66477586288.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/48379259523.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/49086150956.pdfIn PDF document text
    • http://lagrupacio.cat/file/96892952916.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/wakenunixukurukebu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bruut6mfho77qiohc12ki7r025/84940583393.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/napeborifolowafoteweva.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_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 10356 bytes
SHA-256: 54cd001299249aba1348f033a7ddeca4bc47f59903966b192ea51812ddd8d2df
font_02_sfnt_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 16816 bytes
SHA-256: 9620026574d0c89b5b506e4fb785197b22f24c6e31013b6461f13214988beb4e

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