Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b67ebafb94210e…

MALICIOUS

PDF

99.0 KB Created: 2021-09-23 05:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26285070c3d7336a94d55b47dac1e548 SHA-1: 418793e9ef7156e7abbf65a5fabddc5756138858 SHA-256: 77b67ebafb94210ea35dcee55541ff9d9551b0d81009a3725958a5a0ef6f79a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely attempting to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • 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 http://argol-editions.fr/userfiles/file/bogopaxuzivibamaju.pdf In PDF document text
    • http://ecohouse-lab.de/userfiles/file/lexovij.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07e615efb---87131814359.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/23861408755.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///boxokomujumepebe.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/mokiridu.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/fununulikatufigedifaweta.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/gevonatexevuxekajenagu.pdfIn PDF document text
    • http://talleresjpg.es/img/file/32002286005.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/nafupetabinulejobogeta.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/fijopiv.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461baf06b68---butufuweretil.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/11898022638.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/nopasalazir.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1e9d3d461---66835751539.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/naxuwawizar.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/toxipezogujez.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5aab28312---xetogepulejotezuzimewi.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/sunorewonekelanatuxiboles.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/nudopu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/bukanegoworenotisi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354f0449b7c---rerope.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/domewutipirovapida.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/vobinipixewevitavexek.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/54023876238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=legend+of+legaia+iso+downloadPDF 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_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 19304 bytes
SHA-256: 9b2ab3d1f4d90271b5ac1aee98d0cf6d9e9f66886ff8d01f29a7e5ac7bc3decc
font_01_sfnt_off00014ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC5 10376 bytes
SHA-256: 9c105e4bb5f6d3097576d89d5a24993660776fb398bf4874b7d6197909b24ebd
font_02_sfnt_off0001662a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1662A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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