Malicious PDF — malware analysis report

Static analysis result for SHA-256 811c656b12317059…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 05:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1930747dc4a253be8f00f24ee3b09bd SHA-1: 0cf6256c984704dd6cb07059ac3da9f8254f14c7 SHA-256: 811c656b12317059797a07614938e0b27c4e0400aa4a689ce9753c25efa86a8d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://anhbanglaw.com/userfiles/file/bizove.pdf In PDF document text
    • https://adminico.nl/userfiles/file/nulutofixofelogar.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/2959826494.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078afef3f597---75037973136.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1d9e698a16b72ac9fd9753ea73b04a85/49871876788.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/31718063894.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/42367299891.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/bikukalof.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1d22f96767a5981c3aca3590c1252f07/wibutaromubobosifej.pdfIn PDF document text
    • https://equinox-e.com/upload/files/dilolukofefik.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/14516517698.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/rovubokinididi.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/padibuxamosasadoturovix.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202108210736245970.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/8824877443.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/67555736155.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/regamejudipukixuzexik.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2b305633---tediwobifoxanixizagut.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/t7uci7e178md7n0kn4h7ooao90/desopuxumepakimogoba.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e4683aaf---virujigatezezu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/hlonu1517pemkrbqel69lcdqh3/41187443613.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6ae7ba518---90372122973.pdfIn PDF document text
    • http://fotossc.pl/_files/file/47088978360.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a218f83d---50343782451.pdfIn PDF document text
    • http://kite-surf.sk/files/duvenerepe.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/61132561588.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ff5021c90---17873579518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=letter+tracing+worksheet+generatorPDF 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_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 10600 bytes
SHA-256: 60ae9cf3f7155f2c0a1c51c24c31e8bfdc3886c63ff0bcb714b542fbab1234f6
font_01_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 18292 bytes
SHA-256: d50ce478e01003256687bc42acd7bc4dad4a9bc3ba407a9d29f0c14c0b946f31

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