Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2108e047ea57bf1…

MALICIOUS

PDF

83.5 KB Created: 2021-07-17 14:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f86d84039efc1033cfa3094db8d17566 SHA-1: e0173d04cf4622f41c5993a67f1f19f65a9f9f1c SHA-256: f2108e047ea57bf14010e034d0a371e55a91f371a82829aef97510435e7d3e0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised WordPress sites. The presence of multiple unknown PDF links suggests an attempt to lead the user to malicious content, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac71e44358---3194901865.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f9dov1m5rrr7sa4fvndhev6iq7/96474834956.pdf
    • http://genbreedpublisher.com/files/upfiles/file/82951648180.pdf
    • https://rotterdampools.com/contents//files/samuxi.pdf
    • http://aceonlinementors.com/userfiles/file/32412272041.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/b1epvpr5eqo21jhrrpub60t9i1/54011439367.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175882f49f---78396523466.pdf
    • https://skvely-kup.cz/files/file/50331811449.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee694e080a---61669993235.pdf
    • http://truhlarstvisollner.cz/data/file/xovuta.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/4e8421c7ed5af13f89fcce60a633a75b/91714567962.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e08ef724ed2---wugogif.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/07dd37b9dfe1accc68b6e6b197b92d8b/mekajajulivo.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/muzamimiranoduzagotapo.pdf
    • http://quaretti.it/userfiles/files/lumoduxobogujuwabofer.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/mifasogulami.pdf
    • http://www.sosonomo.com/ckfinder/userfiles/files/lufamipuge.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ffc71f6b9074849976b123aa7ac86728/45830556175.pdf
    • http://flygarfield.net/userfiles/file/xuvuwad.pdf
    • http://maskaevlawyer.ru/userfiles/file/gokenawagateri.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4133103bb53a5a1e2192ca3eee12bf99/kisitep.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/048e2bdfa970783ddc2d1e1042995a6e/viduro.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+doctor+scp
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 16792 bytes
font_01_sfnt_off0000fecb.bin
e22402df3f3ebfd2bad45e38c37ae656aaf4c9e9d6b90af3d930544fc4769262
pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 16716 bytes
font_02_sfnt_off00012a3e.bin
2e314dfd4a8d0829311b140d0d9e1ccd6a505e78911279a03513be2ef6b1e0f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3E 10172 bytes