Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bf3ed37fe11800…

MALICIOUS

PDF

70.0 KB Created: 2021-09-04 12:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bdfe82e4d6557c5c182576b0cb367c9d SHA-1: 42bdb2e00f54c728203c1bf1d7af2c74b6af6332 SHA-256: 48bf3ed37fe118001df8a9b78c12296ba74338f4111b59f198c1bcb6693f9848
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or further malware distribution. No scripts were extracted, but the structure suggests an attempt to leverage compromised CMS uploads for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8233a8ad20bc88a8d3421d3ec4604cea/3730923759.pdf In PDF document text
    • https://hanoihome.net/img_duhoc/files/24995439011.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/989af80c722a679cf67d674c0a224cc6/kazabaminekawixa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608245f5e0bb2---polubatepox.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210808_B8AEFA807B3ABF10.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0b9be129---36501142433.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072224fd309c---fonurakader.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120c34e484ed---11041536770.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/51476425208.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840a7768497---46987615193.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/24199137668.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/95743095302.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/xokosajubawa.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/jumizedafezuko.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/tinunugividili.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a96e5939dd52b65f97fd2ed512e38916/lakiwipos.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/fujeruwe.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/gotisofu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/mejuzivamus.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/2478867143.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e5bcb9c53---34956169214.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e969cba7208500a1b55e68893adbb6fc/guvasabadix.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/88167397797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=context+clues+worksheets+for+grade+4+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_off0000b384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 11296 bytes
SHA-256: 5068afe1f5910902ddb3906051368a752ee352e9886b25d785976afffa2b2237
font_01_sfnt_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 14652 bytes
SHA-256: a6b07508fbf8da79701badda0129dda54b695e2cec26a5057f9870313996c162
font_02_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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