Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22ffa26fd6d7eaa…

MALICIOUS

PDF

74.7 KB Created: 2021-09-22 12:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8d7878efe381114a8df701bb5039760 SHA-1: 75173628f5bd99141842c34f604d5961e77a93b6 SHA-256: c22ffa26fd6d7eaa1cbb71bec6306f17b1a10c59075d97a63ccc057eb00ee24c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. These links are likely designed to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://0975811252cool.linker.tw/files/rofuwulazugimejowe.pdf In PDF document text
    • http://mesterteto.hu/userfiles/file/jorenozapabodomufu.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/95374688318.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///wujefevikalipepadujul.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/pedomovuwevu.pdfIn PDF document text
    • https://jjpremiers.com/files/leneni.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e389ea315---wokulukokiwibiwirunozepe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1d5f2ce93178141625dd2d4aaa2f450c/36014262710.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/noletogojarobi.pdfIn PDF document text
    • http://furniture83.com/upload/files/52735513949.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/23768265246.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/86027151084.pdfIn PDF document text
    • http://myphamasia.net/upload/files/wubexe.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/43261999357.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d4bcb51bff20652881ec52648620eab7/vukopilojokinaz.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/82801319752.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/91769730802.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/puxuxibowimotawigit.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/63977399432.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/jiwikanesed.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/damadawosegimedabon.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/puvum.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614096ced3723---82778056200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kong+skull+island+movie+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_off0000bfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 17020 bytes
SHA-256: 2847f75f8c975f67ad8848035412133c93da403e34bf8ca92dd95522684bb17b
font_02_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 10932 bytes
SHA-256: ce6329915fa3c9d8041e3a59b9e5155d5537bd40a171f646def054ba51e2b237