Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c45a00aa5a4acab…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 09:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33e93aee9de9e13f822b62914e3abc0a SHA-1: 6915206650231889617ae85ee9a4cbba10d0c8b4 SHA-256: 0c45a00aa5a4acab38b06a428106dac9ddb0b2c0809074f1d71b6b28fc2373af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crysiq.ru/uplcv?utm_term=how+to+inspect+element+on+android+phone PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/013bbecc19e012297b7f19f520987f9d/46252506910.pdfIn PDF document text
    • https://braus.uz/images/shared/file/kefivaxiruvefodarojo.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/jovob.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jijabetekifomupumagotax.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/lopitawurawopisa.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/93787670049.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/17338707713.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/fopinakafegeduxe.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/9979185979.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/kitopinoriwubizomawivazoj.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/85169759876.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/99588369110.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403bbe2c306---13253643604.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/20736745713.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/muzefibupibuwovifawodemij.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/88455023320.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d44709f4---xazeno.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/92373982138.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/zupij.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc61aa366f---7718343792.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/widegekedaxagerox.pdfIn PDF document text
    • http://www.celso.org/download/1949524237.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/560faca3bb36df1702706dcdaf897ed9/85955329943.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_off0000bc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 17048 bytes
SHA-256: 8d0831564860c63b72e3eba64a00bdce759e9d76350fb21f37e09fe721bfc836
font_02_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 10856 bytes
SHA-256: 0f689e1918ae99ff2f9f1611968788940edd6fe1576e212cc42b869e06668226

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