Malicious PDF — malware analysis report

Static analysis result for SHA-256 60953ced771055dc…

MALICIOUS

PDF

68.0 KB Created: 2021-06-07 14:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 175d1ee400643c2265fcd402e2304d9c SHA-1: a8d38a61cc05c6f105e493a18fcdb4e5b8820398 SHA-256: 60953ced771055dc083c97d8e12df24d3d26e31ecae31247c8b13bdd5bcdbb8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://coretry.ru/uplcv?utm_term=osmosis+potato+experiment+sugar+solution+results
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1ec8f461383821de445dc1e1b9e3284a/15924192167.pdf
    • http://scamps.biz/userfiles/file/2877621191.pdf
    • http://chinasoftcore.com/userfiles/file/%5C/72517601139.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3e4d989a68eb16c58fed1e8a3a85da2e/ripifi.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b90a91171---50502099487.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2fa9a4de086c35089491b8e16584b7f4/62781154663.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nfou0vfp7unbu06nj86ng0cao7/55076497690.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f087d7519493d6986b54d2242c237198/bamibawejavanulesufatin.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3053be78a---14778028465.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6dbfb0212---gumejulazegifoludexize.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/1a65312ff2bf4c8a61d2e6d2af4e911e/5214398472.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/g4uk195vmtsckljrtpu1nojno1/4837132002.pdf
    • http://driver-jazda.pl/upload/file/63099353906.pdf
    • http://dso-fuzine.si/docs/29094016227.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21c3969c3f---loperajo.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/838468316c751bea5b0bbf6f8b34c95a/dorisizexaniworawuluni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cccc.bin
3451dbf424670822012c81b4bc1e9b65cc86a5bfa918b0953279df46838b1d0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCC 5236 bytes
font_01_sfnt_off0000de84.bin
5bf031d939fb0bd48d0530bb642719e76747aa0a318edcc23c286d792c2f99cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 10660 bytes

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