Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4e3dda92ada05a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 04:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e35262d29809f2092b5fae7493015d0f SHA-1: ef661ebabdc8f8d87258f6de00b7240411c031ec SHA-256: 2c4e3dda92ada05aeab49e957cb83895deee5a00d7d64d7aa03032169a1a453a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613156f79aab9---rabinivadezewatufaximuri.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9c078270---wamakaxivaxezaperosin.pdfIn PDF document text
    • https://tepihtrava.rs/files/tifebomukaridiwagazis.pdfIn PDF document text
    • http://edusfera.pl/upload/file/befezitowugar.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75558211514.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/zamebi.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/91080888731.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3de6b033---91622266693.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/71997024183.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/27021664348.pdfIn PDF document text
    • https://nistd.in/userfiles/file/kesoxagigisinutibewobopos.pdfIn PDF document text
    • http://vln.nl/files/file/97814130731.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/1025074854.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/zafuduxiwoxokikulob.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/xufogebug.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/91549852165.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/45814949247.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/regux.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613714ff0abd9---vomajebuzije.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/78574518718.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/jaxazotesew.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/22241790983.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/91267430450.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/lolupewafexas.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/zazal.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/pejunegenekubusofisafado.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/13138306998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+hack+phones+and+computersPDF 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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 15844 bytes
SHA-256: d5c106913e190902a9dcb7d9c47ab03511fbe8eba8dfa9bd0aa58ef63d41cb94
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 10912 bytes
SHA-256: 31da5e3cbcd3de0016f330df6298a4f12bbd895da71baf03221b3ba9b44cec87
font_02_sfnt_off00011971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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