Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d755fe81d06df4e…

MALICIOUS

PDF

79.1 KB Created: 2021-07-08 10:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 05f8c4a50e11f60d1420cbac2887ea9b SHA-1: ff27d7d930378476d514c28722600aaaa87c1df0 SHA-256: 9d755fe81d06df4e4d98200c049902bd42a54b13862f083faaf2bf104ac05c57
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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
  • 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.
  • 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://eitmedu.in/ckfinder/userfiles/files/67493219786.pdf In PDF document text
    • http://aklond.com/UploadFilesfile///2021050106163481.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/vavanesekixazokaxiweke.pdfIn PDF document text
    • https://isosklo.cz./uploads/66829942982.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/56272378852.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4200dab08c---99349141156.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/vakivuz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kdupmfrpsmrtpv8a324kkktege/ripulolubo.pdfIn PDF document text
    • http://fiscalonline.eu/app/webroot/files/userfiles/files/fakonadiguxinibu.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/78667114366.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/tufidagumi.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/71426839963.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/tabibubefoxinuguwulo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160708ee6d4d40---gafabos.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/vawuga.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/21303381050.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097b83d7e196---94281101445.pdfIn PDF document text
    • https://micsys.in/userfiles/file/2332235492.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/72e67f5e5093a636b645ed90293ea882/1364761114.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fab9be42ede3cc2c5934391d6b561b72/62919780108.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/dumuk.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608cad479a5d3---4721547791.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/50089167670.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/79e4ef269659e822d1dc6ab78323269a/sowonasoxifularet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=a+solid+is+in+the+form+of+cylinder+with+hemispherical+endsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFF 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 11068 bytes
SHA-256: 4a3b9d63cca7c3f6c280aa79c7cee822d897e9364b2f64edef17cc74ff78d7fb
font_03_sfnt_off000101f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F1 16868 bytes
SHA-256: f81c87d085f78427169046f547c149767d7d84782c8824b3b6f4c15152be1b10