Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cacc31b5256dac4…

MALICIOUS

PDF

441.4 KB Created: 2021-08-05 12:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb71d88a684fde4b3110df5a489a6460 SHA-1: 46780e0bfaa1b13199984414db30bd4632486b98 SHA-256: 2cacc31b5256dac4356ec8a6d922bca9eac780f93f76d2ee9344a8e07b6879c2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a malicious browser extension or update. While no scripts were directly extracted, the presence of numerous URLs pointing to compromised CMS upload directories suggests a mechanism for delivering a secondary payload or facilitating phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9671

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088ecfa542f4---62492972681.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa200b17c---kifapato.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/94786985399.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0set14sjqcjur1drfdhdsjade5/toxowajurafakewetu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fa70b5dc5---bemofovir.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a509b92f0ef---wavewofenezaberosamon.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/dawaduxunukesariro.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/46847302370.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/61558456154.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58091763ed---temazuxilov.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/zatolesabulitabemu.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/33919494260.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3be7e2fe6---giponipujuvefudaruxopoxem.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/20655217252.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/bejugezikixiwit.pdfIn PDF document text
    • http://candientuvibra.com/images/file/26493580638.pdfIn PDF document text
    • http://ledins.lv/cms/file/75973249770.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/86ae002bc1156ef0599f48b693ce6b12/kepilib.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/82822959342.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/latewedowixidobeg.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/rosiwitizedofuwimeka.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16096a101f414e---13000603535.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/99227030338.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/po7nt7674q9c1viuukum098dh9/94180767483.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/10928713247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+compendium+of+forgotten+secrets+pdfPDF 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_off000676c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676C1 17988 bytes
SHA-256: 4303cfda1800299f9879696acfa9a29fb66b7f6aa5eef81ab9a9ffecfa90d6b5
font_01_sfnt_off0006a622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A622 10924 bytes
SHA-256: db22d162f10703509c650aa087d792bd66fee7abb473e40f2d4a51184be57410
font_02_sfnt_off0006bf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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