Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f13ae8bdb5e8713…

MALICIOUS

PDF

85.3 KB Created: 2021-08-17 04:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb1eaa1b0ac1ad89def705a117ce27e0 SHA-1: 51beb828737fe23734cb9f386ad92d9b80a08f96 SHA-256: 0f13ae8bdb5e871309a458e07ee5b0ae4632e95ab93b50e4cfe8ac087030473e
164 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'Fake invoice / payment lure' heuristic further supports the phishing or scam nature of this document. While no scripts were extracted, the extensive use of external links and the ML classifier's high confidence indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://simondaulte.com/ckfinder/userfiles/files/dakarurepaxe.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/292052247163.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f8eaaca3---22142141540.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6rbtj7e3ke25tr1pb5g7rlquv4/90715646840.pdfIn PDF document text
    • http://salwex.hu/file/midador.pdfIn PDF document text
    • http://sinoorchids.com/image/file/30846366869.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7a16b4cd4---loragisepetuloxenagusot.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b90e0b71512ba43dad648102d8fe9310/23050802431.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d81a4ee2a---94496662351.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/f6e8c836c0802a5a9c5f6e6123c3890c/84444973000.pdfIn PDF document text
    • https://argumentua.com/i/file/51715538550.pdfIn PDF document text
    • http://www.centralperdana.com/file/83139795141.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/67561556771.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/26572618222.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/65449245577.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc5e55f61---zuwibasuxaz.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe0917f96---xaxibexemuzarurewiluneze.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/bd7dc67a349d912b5b32a9cbf42744c4/bogaxaxewizamixuj.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b409e80a---44439436448.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107252ad89c9---43103431833.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16119ed86df2e5---zozomusup.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ba6dcc6802d42b9eef84d4b969c3e96c/wumotitisuvej.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/84539281400.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2f07n9v54vhq2l513mjlq5hlfq/86992273957.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/eo3ddq64bcck05pv1nqvobe1g4/78722023513.pdfIn PDF document text
    • https://grandegroup.net/files/jumibezagebumuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=abecedario+para+imprimir+letra+por+letra+a+colorPDF 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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 10524 bytes
SHA-256: 3ca3567b12d5fd187d128d6fd617fa2035f7fc348fbd0fad1986cf52d80e721b
font_01_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 18444 bytes
SHA-256: 8e98103ba2774e33095ad77ea4331fe1f2d142a20753ec27d332e03b8eecb941

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