Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0b90ac32b52341…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 12:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d28d1308570cab1b095b781a80d57dc6 SHA-1: 44fe0004394afa5bcbb834f728866f0a6a2f499f SHA-256: ce0b90ac32b5234143bdf483b2d5d0d608834c1983c506b7582089cf62653c51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yuanhebiotech.com/upload/files/51362828062.pdf In PDF document text
    • http://bearings-home.com/userfiles/file/rotuvatujimonobadufezubob.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/12370174468.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/63844493935.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/gujiraseg.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/jesamojiwexoleguremaraxev.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cf4c279fb---18648898903.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c99571f1d---notesuxuwebalo.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/44779255897.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/64289206999.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/womuzabezegarin.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/kuxolulajijobelof.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/mapuxakoxirefukososedigag.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/gibakomedonurepotuzal.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/zigukiwojopuragoxu.pdfIn PDF document text
    • http://vo23.ru/upload/file/zenegusexisav.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/23384163386.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/50233394048.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/gokopotajuzutifi.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/vadenu.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/58082276128.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425ef8501d3---2919506603.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/52325176448.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/210688551.pdfIn PDF document text
    • https://mfdesign.hu/files/file/8113757627.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/75791428905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=emily+oster+expecting+better+pdfPDF 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_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 18328 bytes
SHA-256: 37608ea1695221be94a79240180287565e83a3d7f877003ecefc785d7e900059
font_01_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 11140 bytes
SHA-256: 5def95bc8aef90b67f7435ee66cfde996b032f2090e5ba97fbf35fcd2eaaad9d
font_02_sfnt_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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