Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf34783257b8f2e4…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 05:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7076286eda68df8a915308dfc57e2572 SHA-1: c55cda8de2f961fa10e7ea11f59e07a3d2a78ae2 SHA-256: cf34783257b8f2e47e8160f62bc06eb845b09c22e7250e8c802b9a91d330a228
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely attempts to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nomylo.ru/uplcv?utm_term=essential+grammar+in+use+edicion+espa%C3%B1ol+pdf PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160706e59ecb96---sokufelikerisukili.pdfIn PDF document text
    • https://avenue102.com/uploads/file/sapuxaxunibupova.pdfIn PDF document text
    • http://gr-chem.com/upload/files/74585074010.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9b2d9da6f---25613667070.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/49693732411.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/20179869755.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8c077b9a54b2b7a9c8ca08e0a1aedd30/96260683535.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16126d1f9b3883---8295198697.pdfIn PDF document text
    • https://schmitz.cz/res/file/25495565150.pdfIn PDF document text
    • https://masukpt2.com/contents/files/fuzomexagewow.pdfIn PDF document text
    • https://puntoagricoltura.it/file/70333186281.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/okbilds7ckf11moj4c45q245dh/rakifuzoxevulolozetukid.pdfIn PDF document text
    • http://zuche0551.com/upload/file/pozufagijepejegaga.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kafinotagol.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210803_9BFB224623A9B078.pdfIn PDF document text
    • https://luminex.pl/upload/file/lizawumov.pdfIn PDF document text
    • http://nfc.soo.jp/file/jabafofixa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a01be42a67---xoxamoma.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/pafoluguxak.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/287eb61t0q2r0lj35mg1d59t6d/66041281340.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/32953641811.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/danofumakekene.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/59900700554.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_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 11252 bytes
SHA-256: 76f41a8e4a32a6d6d27590d170b2762b518b1314495612a756ef8073a3f2f7b5
font_01_sfnt_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 19176 bytes
SHA-256: 9e5e0aa42699d3b5b8940dead49665cc09de23f138fe0915ba7a2ff39c175699
font_02_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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