Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d723d46ec23cfe…

MALICIOUS

PDF

74.0 KB Created: 2021-09-24 05:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c174bbe6f4e260a7e94b8c0fb89d902 SHA-1: ffdbc6b4c09a861ecab09ab4eaf481f8f558a0ef SHA-256: 49d723d46ec23cfe22383ed01f6b052e0a1f0dd6102efe4a073aaa002527d23e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a payload. While no scripts were directly extracted, the overall structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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 https://chcial.ru/uplcv?utm_term=download+mate+tube+apk PDF link annotation
    • https://a-guskov.ru/uploads/files/57132965551.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/zozasadupeji.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/10681045471.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/kexaxojenoforesalam.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/kixovanebi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7590af27a0cecb7cdcedc6f983b478b4/4454255960.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/741924728d7050e2c7bd58468ac95c38/47370319229.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/23375983233.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8djv1rkvr1v0gp3jr22gdn8pm1/mijufuxemazogawomorugabid.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/39608056428.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/xuxubok.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/jenopezupu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/03cd498915169a05c2657cd9b86a2bd7/64995508066.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/bc947d6ef68291229e748c31f66837e7.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/tagirexu.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/35659682253.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79512076101.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/13792813203.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/fimiretupivizamisonu.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zidexu.pdfIn PDF document text
    • http://medi-sen.com/files/files/35164232449.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d21ff65a347e2d2b8be94eb5b1ef2a19/jotenibigabamisekipeka.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/12755821716.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_off0000bf2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2E 10612 bytes
SHA-256: effca813898e6bd7c030f363f9afe202e8445e828d1c649799d4993745f52526
font_01_sfnt_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 16712 bytes
SHA-256: 3f007862bed5a16fe0796f1c3b88269e9bf58e5b3ce973e03d7f79120dfb6d80

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