Malicious PDF — malware analysis report

Static analysis result for SHA-256 58836a88253299b1…

MALICIOUS

PDF

83.9 KB Created: 2021-08-24 18:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2530bae1f39c7b628fc8346b08197899 SHA-1: 56b4af0c9e62da9f2b1e626fbd961187b7154656 SHA-256: 58836a88253299b10c7143c781a6a32bd49a51cac6359a4146d60a927864e2de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://industrialdevices.in/uploads/16621260859.pdf In PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/83621913197.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/tufibidosuvefalapel.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/zajavapisafobokibeto.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0232b94a0d442b86d704564e5c15ea4a/87314129996.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/02bd9c8633db2b79d4efa676d89164ed/kigubexefowesixovudisasur.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/zanijap.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/i8nbervomca9ucfo3isl13vcir/70394168308.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/67790fc374c84342e1b829f3e79b806d/tuwesinemotevagowovim.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/84145965942.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/a2hb1f4q2uc8aegd2gneea9fsd/bikedapes.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7fc1a90fd3b5b89843372d769a7db691/61255115852.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b56cd26eedd8276c29e2d5ff0a0656f9/popawazanawududabipabe.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/e8b33228n9lvpk1fg53k7c4v02/88957674347.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/lf57ov29fqh3fs3m0oh7uckucr/5451225687.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160749a77662aa---13182669853.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ef0329e8bbd74eddb6c11c0a5d9b71e/zilugerafumiralazakajo.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/1e16c8022ed2ec4679d774846cbb5912/balumavewegifusiwogiditaf.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210618_582992BB94A9CD00.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/fagegugawaxoxosuvi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gk5uikspc3gc88qrqur1q7c2u1/zakoxixebofidivevirog.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/55283329289.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dad281aff---74375484352.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16098da2ed0b44---54824831316.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84dd988a4f---62856606559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cricket+news+todayPDF 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_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 15956 bytes
SHA-256: 45c6d4d364f80fe6e1fc1a0a3d1d5d2c3e05628107c4d7df99af1ab60a99105f
font_01_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 10640 bytes
SHA-256: 26c5aedf477377e767a184d931db14b30a34c3bdd7bce275e9b05ad8510e290c

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