Malicious PDF — malware analysis report

Static analysis result for SHA-256 107895b8079c8a46…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 01:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47a4adbdddba84b23c37096ae269c2dd SHA-1: 9f9c5bbb626de3a449e05dd342d00301f4cae2e0 SHA-256: 107895b8079c8a4657064c289a0f53dae8ec7929d92912885aaddc46caec70a0
104 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 websites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the heuristics suggest it's designed to host a link farm, likely for SEO manipulation or to distribute further malware. The embedded JavaScript is a common technique for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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://crysiq.ru/uplcv?utm_term=bookshelf+app+for+android+tablet PDF link annotation
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4107741c550520a729800c876b3efdc1/64051531363.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/wumunideziwoteb.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c4b4f697c8b997dc68e0c24d5194f7bc/36162036275.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/44509706007.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c83f01c076198831292ab5098ddfb939/39266891073.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/punezabulugilevoporejove.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/35687548730.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/16913480393.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/10189918979.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0de4059ae---85014859469.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210910_142536_194.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a188600cf2---tupuzixalewomemebotuson.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/narevija.pdfIn PDF document text
    • http://epicridesnepal.com/files/muduzalamovomukogusofa.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/24074174294.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/55379449996.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/meduvesojexur.pdfIn PDF document text
    • http://darec.sk/files/files/41307581585.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/bomilititatowolimigu.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/dexugeketakagapozamebid.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/59297980233.pdfIn PDF document text
    • http://amkchem.com/upload/files/lajavoxujosa.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/20798465655.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/97466631665.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/bosagibigotojevi.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_off0000bbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 16684 bytes
SHA-256: 0f410d78a4d6775589170e5036903619e14a35662ed474f43bb8bca745a11af0
font_02_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 10880 bytes
SHA-256: 5167b09a4b1331ec41839ca656b107cb947fe6cb659f16f42bb62c7a840d3987

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