Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05a716c3cd87489…

MALICIOUS

PDF

47.2 KB Created: 2021-09-28 17:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 676bc83b8713cf576717c2c278c3e1c9 SHA-1: fdc3f90923b3662f751bb963e7c9f71d0e11e233 SHA-256: c05a716c3cd87489f706ed9ec18be2f74d7fc57c87f019f05183a8ad31a58956
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or malware payload. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7444

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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=xposed+parallel+space PDF link annotation
    • https://cedd.saglik-network.org/uploads/file/59992749262.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/zojefasadavejipuke.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/96692218771.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/34677334891.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/22230232719.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/26655091985.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/gewedobut.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480bcca1dda---8120404104.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///jawubulasizajowopovam.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421bc513867---jikaxuzenabagukenoj.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/29738031637.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/87636606007.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/pigusulekoturudagagurelab.pdfIn PDF document text
    • https://revive.fashion/upload/files/99568871675.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/12006398491.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/wexawunaxujod.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/kipiguwebedogevinorefu.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/75534106283.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/varofulebadarero.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e4f7b2823---37795360435.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/dukekudasituguvitazoje.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/85582446041.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7692a97c7a806a5e6728f27817fb7e77/modewarifomi.pdfIn PDF document text
    • http://wjcopy.com/upload/files/zazumu.pdfIn PDF document text
    • https://demowz.reikor.com/webimages/files/waxufilesunaxanofofuk.pdfIn PDF document text

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