Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d9ca59ddec87e8…

MALICIOUS

PDF

87.7 KB Created: 2021-08-08 15:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af3fde8438afcf52e3b122bb7b388f8a SHA-1: 31407616e4559fb5db3b0ab2f0449cb90e4e2548 SHA-256: e5d9ca59ddec87e86b9b514e9d695a923d6c486314bcd5ca52a5f682cab14c47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable domains, indicating a likely phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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 http://prime42.ru/userfiles/files/wezuduzozak.pdf In PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/85b7d8332a3e74c44c847dd82ced4273/57837871804.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/fanuvalok.pdfIn PDF document text
    • http://modern-pro.ru/files/file/bubirote.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/172f8100a77f931fe792aa4a4ad4e6eb/49872705774.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/bisuvutidudunovelulenuken.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609829fcc3654---lumuvare.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/pezizesaje.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/31268982382.pdfIn PDF document text
    • https://wrd13.com/force/file/besavutikagizubela.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/supixokejilerorubokaf.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/nemikaj.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/tebukizugofomu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d5oqpkiucs36ht452pfr07pujf/liwotupopaxe.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/8018459070.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/wifuxezuvomibafa.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/86116625111.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/garumo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/92aabddc17db6939a9c40c383ed535fd/97978297051.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f413e1ebe---nonafi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ac61e05c9121579c852d7c8913171e4c/77678835130.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f6b9a241510ff93bb8ac4015d090a07a/88557594141.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/66qq1g9d0gudsr9qvht5kkn25v/37348750194.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/28f73ae4ce9336b5bf85fe2dbe190aa3/78443285513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+calculate+rpm+pulleyPDF link annotation
    • 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_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 17468 bytes
SHA-256: 30ccccd4857111cda3eaeb3a638ffb83bfee117e37c2a581f8d5cd13683a844d
font_01_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B9 10460 bytes
SHA-256: d7796899925b77d1f0151f73ddf43be688565afa110900ff160eaa38b8f9266c