Malicious PDF — malware analysis report

Static analysis result for SHA-256 f017b7d075ade44a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-23 22:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93c8156f0543839c2b9841e67498a86c SHA-1: 51740ec10633a17e1dd1dca4fbfbb19c7901fe90 SHA-256: f017b7d075ade44a6f1814d8e5f87d1fb744b13d98d1007587549c7b8cff96ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://canevastoilestjean.com/upload/editor/file/17694917760.pdf In PDF document text
    • http://gardatrans.com/content/Files/9097920207.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/42559904065.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392220c3d89---pavipopele.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/parabeluxolosusuburelare.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/panemimeniguket.pdfIn PDF document text
    • http://vit-physio.de/file/zimirugetefuwunujaro.pdfIn PDF document text
    • https://botroul.be/uploads/37698520731.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613608e7d2187---65036554989.pdfIn PDF document text
    • http://hanifeugur.com/image/files/95952781532.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/81701570618.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210911_074646.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1quk8qit6p6o3f5epms5m9fues/93270671173.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/14575631607.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a052c69a---60630203634.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/11296138433.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143de7e6e5dd---zivevugemivozuled.pdfIn PDF document text
    • http://519pf.com/userfiles/files/vaxupi.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/feluxopatasofij.pdfIn PDF document text
    • http://parentini.it/userfiles/files/20558185752.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210913_085257.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/87686896028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chal+mera+putt+punjabi+full+moviePDF 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_off0000c676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC676 10920 bytes
SHA-256: 1cdc7ce42780881291e4bbf2e274a2143068f8d6068f678bbf882edc79af7475
font_01_sfnt_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 18276 bytes
SHA-256: bd954e3d15266d4f77c038bfb304b8cfb1689d64ad1aa28ac4d41464f63643ef