Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db58e04405521af…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 09:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 016d332d1bed331e620a1e8677a9cc58 SHA-1: f9b3d2a320fb44e942f4b745fffa1779c8079670 SHA-256: 5db58e04405521afeb0816af3fdb5d95d63e6a3b3cf08b6dec52d68af8ed673d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to potentially compromised or disposable hosting sites, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mldom.xyz/web/img/podborky/files/rufetobax.pdf In PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/mabigokugo.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210927131310_298815541.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d9f75d6078c13fc02096313ec67d6cca/dufoxovoru.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/tuviwa.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/84188824004.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/59958211975.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/92051017000.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615010d2a115d---tulelijixujo.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/nasozexejadaxepuvujilizaf.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/62098140191.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/retijutawagetibepawirubov.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/18992374328.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210906204721.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/47103019772.pdfIn PDF document text
    • http://comac-international.cz/userfiles/file/remomoberiserox.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/31500068957.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301cc6c0ef6---17694589784.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5658f0c48---42528544680.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/76177850900.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9lbn13e3l8ouesmellakp0s87v/xuluxexivibarowerivudus.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/18440657946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=checking+internet+connection+in+androidPDF 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_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 10556 bytes
SHA-256: 17fc0584e4e2d55b6ba517f3fa418f32f567fca2208fd6ae64d7822dce54074f
font_01_sfnt_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 17708 bytes
SHA-256: 9cfcf75dabb089f50c19cbe74fa94f78fdae28ba406074834f97347973d5adfa
font_02_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1