Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b0471aa0f90b2b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 08:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3cafe92fd03d65b298e89c168ed1cba SHA-1: 9d0bbc3b33e7883444bc7dfb2510fd9c060c20b7 SHA-256: 62b0471aa0f90b2b0f8aa7851995cfed2c387870deeabf8eecbe95476ca3b809
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and link farm heuristics, indicating a strong intent to redirect users to external sites. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' further supports a malicious classification. The document body is heavily obfuscated and appears to be non-readable content from the wkhtmltopdf tool, rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=ninja+saga+apk+mod PDF link annotation
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/vibavu.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/jubugoxi.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/xuwudipuvevidogez.pdfIn PDF document text
    • http://zimmerei-possert.at/bugojuvo.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/94032306284.pdfIn PDF document text
    • http://hidramaco.com/files/files/69418855806.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/1425520968.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/49516410497.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac89c536a---zutix.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/tamemu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/391a71929ef5c26af350bcd1818cdd39/60981317390.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/wetolimiji.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/38765c06124ce2e56b2dbcf42a207c69/jazunifudeder.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/20082581645.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/rawuzaw.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/18511504756.pdfIn PDF document text
    • http://tianfonmm.com/d/files/10462445049.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328fb954a6e---73941379331.pdfIn PDF document text
    • https://designclarf.it/file/potafozanasujabuzixuze.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/60411824110.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/64805918648.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/nufabun.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03e40132d---lunubisi.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/1502244021.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_off0000cd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 18932 bytes
SHA-256: 2b7ddef3262178a9239a1534d97805183db1a1476bdd74b21eea8400ccc09d27
font_01_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 10560 bytes
SHA-256: efb8bc42492b2ef2f186799a94cb9b21737433abee24d9ce185d2fc3e1adc898
font_02_sfnt_off000115e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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