Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4466e506495ac58…

MALICIOUS

PDF

77.0 KB Created: 2021-07-24 07:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: addded044b8ffce8b5c7a8dbdcd8a84e SHA-1: 0b7a2014373e642c4c69c3499095738b6e20db0a SHA-256: d4466e506495ac58a4e50c94ef12904e9234bff2e2abcf4d74e42e974707bbdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ipsgroupjjn.org/userfiles/file/nixepidebomafiwo.pdf In PDF document text
    • http://bulk-supplies.com/userfiles/file/pugedipuwejefubebo.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105170049556512.pdfIn PDF document text
    • http://zimmerei-possert.at/70011924233.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160720f1e89d36---zuroluz.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/2e0c2a663451078df8adca23e014d76c/rikupafagijasifofi.pdfIn PDF document text
    • http://aimic.com/userfiles/file/falabok.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/38ad3342db1cb0f63c9c699e48a99554/gejotenik.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/webumibizezimazivubevod.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/22896611156.pdfIn PDF document text
    • https://esvigo.com/upload/files/ditavoxerorite.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a33b7707b3---rasawaxewaredufa.pdfIn PDF document text
    • http://runo34.ru/attachments/file/49897531901.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/53614478020.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb1c4b98e1---ledisegazokave.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/99752244396.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/99871465792.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/muzudebisimirenol.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/69749845349.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/kilijuwokava.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/fuwewafewivefobug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=microsoft+office+2013+professional+plus+64+bit+crack+free+downloadPDF 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_off0000c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 11736 bytes
SHA-256: bf97290378850a0c8c7690b0766b95ec35ed20f46096093b534f8a9e992e5a2d
font_02_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 15856 bytes
SHA-256: 7f2d478d09a1de248f48cce3d99f923c7fd603c42409839f6dae15de36349173