Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbc73151f3cbb85…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 23:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b9f45bdf8722381f9211074891269a6 SHA-1: 92cab10713f3a6c30cf02ed8ee2aaf4fa35fbe63 SHA-256: cbbc73151f3cbb85d08debd8154ed2a90574e653465b26cba5a0cbeaa445479e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The 'Fake CAPTCHA' heuristic indicates the document's content is intended to deceive users into performing an action, likely to download a secondary payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://crysiq.ru/uplcv?utm_term=pokemon+let%27s+go+pikachu+ppsspp PDF link annotation
    • https://dampinggame.com/calisma2/files/uploads/bapudilezemu.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/rilubo.pdfIn PDF document text
    • http://unsersohn.ch/images/file/479113898.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/vepasiwole.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/60163875444.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210910012603.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/25210569239.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/vitilobojo.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/femuxanuzikolovotonis.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d4f2a0b86c6acb9867c60d393edb043/tumasiwimadobuxawasetige.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/794494939.pdfIn PDF document text
    • http://93564497.com/userfiles/6823168081.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e42bb1fd4e5ff7545ee169b1579e1589/givojumiwokefixedin.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/sisapogifabur.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9a494a1c6d7d02f86a9de247dac137bd/xibetexelepasoxulilo.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/gevibugisitilazejojope.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/kisadi.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/luwumebetafujibizokede.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/6915577121.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/64723182209.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/11258901490.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wogomewuwadexugowulutut.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8ep39hq0mcr697panafo8huclr/86400868563.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/meforefo.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_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 10948 bytes
SHA-256: 06f84ab3f85e6e040debd3aa12a91ec1244cb42ad54e2cd215f71604b7437471
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 18520 bytes
SHA-256: a6ebb8c3e154818c7b83f530181ecf3e3fc6d61d1134737f845b4633e490ce04

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