Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4549f590dec5eb3…

MALICIOUS

PDF

91.9 KB Created: 2021-07-29 16:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee96a3fc7bee071b3ec713620bfc98a9 SHA-1: 90630af8efdf78ede6dca3f5e93199ddbb177b6e SHA-256: c4549f590dec5eb3c2db9478b0ac76aa58560f7dc8ef140f1500dba49aa757d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=acog+guidelines+for+vbac+2020+pdf PDF link annotation
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/819fb32c06f916631034abcebe8bc672/dadogumupudamanopekizu.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/71505174707.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cbbef06d5---gumezokanunexopazasilu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b473ded5e8---48535483109.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/iudml43n0mppfjfuhc3baud5qc/19291328039.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096e2cdc42ed---12544281249.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kamagowerorulove.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/lugulipasopuxoxelebisexe.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b39c0178ea832cbde1d3456b0b44e8c5/87959611512.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926de10ded8---sovafizin.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/mitomesoxatowato.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de3b82afa---ruwemupavex.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99230ade7---tikojexexiluxekunakijof.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a2cdd4ee8f554adabe850b33a464bc52/varikirudi.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/puziwobeve.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737ff8e4b80---vuxixixivofijoserus.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085bcb9cf952---lonuxusog.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/kabasetekovotumedu.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c0827d4cec19ea9247ea3acf6d99858e/duxesonajatufusosanuz.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d7e283fcf---97018672705.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c9083ed9e---nesunitixosemiwebo.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/pavuwulerijiwoji.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/79279546684.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608253d8a4d22---gulamopopedodezatojivif.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/483iv9qad020f505momlh3pd3a/zenekujawegunarepave.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_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 17300 bytes
SHA-256: c31f6d68b24dea5836394ec1690ede52b90c0880de2dcabc77e71a94480dcb17
font_01_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 11224 bytes
SHA-256: d439de31a2b4e335694e45914f3a5fa08a68dfe31dc58b6814016c108ce5fe65
font_02_sfnt_off000148cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1