Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0b0d026bc79620…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 11:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0146e990e9971877896b40f296c26b33 SHA-1: 2ee99d8eff166472a12f73ee9b697a6f3a76c5bb SHA-256: 2c0b0d026bc79620378944f804e66a04ed10fa9a79d370ecfe9f1a116a41a0a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to external PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://newcastlehigh1967-50threunion.com/clients/43248/File/vemibixabuvupujerasuvi.pdf In PDF document text
    • http://cga82.com/admin/File/navakupufif.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/25515748575.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/673903111.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fdf43e4b6c---zokabulabenezonaneg.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae245ba31c7---60881728027.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/18963778236.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/sexab.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d6lggturj621piuq4md9g6pghm/22715185444.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/17344868307.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/fujogumeluwadibazewowova.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/dugifa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015ca5d16d---napexozamesasuduvasojeg.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/lamasidur.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cff265c91e0---fufurejora.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/dc169d586e76834e5513b8e93e5f4208/74756072498.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/mukoleberujuwibeko.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/10278720191.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/34571945251.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/22093738060.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/vezuxulivafubul.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/wofapuzilefafikenir.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/cb980c2281d02f88ca7dfa7444c2c87a/domur.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ab9172532e299b9152327653e0165c7a/wawesesepif.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/keteforutexadututuxalapit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=small+blisters+on+headPDF 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_off0000c090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC090 10728 bytes
SHA-256: e76868ae93b5ecdeb8116ac1e36e51ebb18d07d2eb280f4e514777c6e24bcd74
font_01_sfnt_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 15780 bytes
SHA-256: 52c31ab5c5e9b9ac0ab00647bac93a51dcf17927b60c6510cf8c4c1beb5fd4df