Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3409f956be1f8df…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 16:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec7bfbdca4b544c7442f863296f7d5cc SHA-1: 62f56d056f915a26211f8ee40a55d174b5a0447e SHA-256: c3409f956be1f8df29d9812d3c661ebf8821c58bcc27a34cf5d0f7845e5cd8f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various disposable domains and compromised WordPress uploads, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=resume+maker+mod+apk PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613372c47b4a4---37245584639.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/jorusimezodizutegukagul.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/jusokopafamamokubidoxo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2678e0b7a1c04ac830742e544748de94/9068954478.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/36965104071.pdfIn PDF document text
    • http://boldogelet.hu/media/jaxedexozoguvaj.pdfIn PDF document text
    • https://tuinvandecruys.be/file/84438954542.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/gedajisoxitebimavusixedeg.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/gugufurokarom.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/30115760956.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/rokewaxabiki.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/55209487448.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/44848459075.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134c7e226c75---19826964833.pdfIn PDF document text
    • http://trieuduong.com/images/Download/rulaludenizubalu.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/vepuvabesaw.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/nobomiwinoninumapezi.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/zemafujuluwurifejavisow.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/wuboxowa.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/fufas.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/vitekibikuzijegijuta.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/99529903808.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-1/20210901120352634652.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/70082012451.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/19029074713.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://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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 17128 bytes
SHA-256: 7a0dc17040b0e2373366bd4683a3a7cfd509df63af15e47a3c92cee5867fee3e
font_02_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 10448 bytes
SHA-256: 31e8c680e147d6f0d42aeed88cda7cbcf7826a11d9296162c904e31af309deb2