Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfad05c95e31970…

MALICIOUS

PDF

89.6 KB Created: 2021-08-13 12:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40c986c059339ee7f5e364e91c672e22 SHA-1: eab08a2c905889e89a5d3f0e83300a01e05b58a9 SHA-256: cbfad05c95e31970abeb5706241e7d732b0ff4ed8a0c1ec9d3140da341411070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://pixomot.ru/uplcv?utm_term=how+to+tell+size+of+lululemon+pants PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872978aa0b8---ziguvewolekadiz.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/4245005722.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a14cce0d2e2---bufavorifabumufepugavoso.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/59013523909.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/81003798575.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b83346821e918960aa4eed1e16ce71f1/9530076172.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cfb626fc2---wowot.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/pogapuserituwejudupusur.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/39512457273.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f69857a15---fadodogonex.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f86fbce7c238a5019a43f419cdfb6066/59572945925.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/fagiporijeku.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/vokadi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c34db8a4f---xirenivolin.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc84397f29---3027236843.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/wisizadukegujanuw.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/61501222762.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/dinogakutuzedofilajelup.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kelasenejexubudevaxomisak.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vmtk3gqnd97plg22851hpivtjc/lujowu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/chifhld7p9mc86vu8q10a82qm5/nepixalunolef.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/42176376939.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/29968081503.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a90gn8lm308g3igdm24og335s1/ramofejojuwoba.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/a3bee36d82fe7fba2ee0ecfae3321088/rawajowini.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/bodujepil.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/92440964996.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_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 19076 bytes
SHA-256: f394b6f6cffa0edecba07a36cccc7009f32baa2adb4e5ef52a84648a3163eb1f
font_01_sfnt_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 10656 bytes
SHA-256: bfb5cf5e0cc3bf11196c876715e8ca41043e950a92f40822028db0bda223003e
font_02_sfnt_off00013f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1