Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d027959e5c08960…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 15:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bd43f0fbf31ccd4f2cb1b76c3d1783c SHA-1: 2e87a3bda7352927c93b8556f08e9379175b0eaa SHA-256: 5d027959e5c089605b0b49da20e2d6230e9200d46d39a598d63557729eddba92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=text+repeater+for+messenger
    • https://dichocungtoi.com/userfiles/file/30500014436.pdf
    • http://miyisz.com/mingyi/images/userfiles/file/pojuvatekotesibebo.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4ecbe07ef4e5a501044b6f0294e10f7d/45024141058.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/wusube.pdf
    • https://relans-nn.ru/images/docs/file/59583231609.pdf
    • http://topup-fight.com/ckfinder/userfiles/files/jeloreketimore.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/76570928864.pdf
    • http://dkind.net/userData/board/file/zafawoxitadi.pdf
    • https://egc.ecrom.work/syo/files/revodasokexewowu.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5c8b099qu25f1klijsbbn4ioii/newodorivelepopapuzu.pdf
    • http://filtrydokoparek.pl/img/all/75476766850.pdf
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/48592707909.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/71306783209.pdf
    • https://asiarsolutions.com/userfiles/file/36435383079.pdf
    • http://liebherr-tr.com/userfiles/file/26754798293.pdf
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/mulojejozosivupamotufemu.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133376d57848---22648875054.pdf
    • https://rajaketiga.com/contents/files/34396095595.pdf
    • http://studiomanzella.com/userfiles/files/77983927817.pdf
    • https://rajaunited.com/contents/files/zowawode.pdf
    • http://esipro.fr/userfiles/file/292375383.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/enjsvkcppjv4101ddm3do61dd8/zugek.pdf
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/95449735212.pdf
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dovesegubokibazapagawizu.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/lidavaluzopumopuviga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 16792 bytes
font_01_sfnt_off0000f3c7.bin
9955e442bbf943b5136df8fecdcdcb43b7a4b95951642296ff8fee28ee97b27a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 10628 bytes
font_02_sfnt_off00010c24.bin
4b5823091ecdff21e5380f5f7cc089058b5637b428ee0511a5158ba321280301
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 18084 bytes