Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f1569c9b7a4a3a…

MALICIOUS

PDF

89.9 KB Created: 2021-07-29 20:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5a9ab6b88d7bf05817cf9d6d80909f2 SHA-1: 8c4e21b15aa99e4ab3a03d6b2ef41a8b5a7489b3 SHA-256: 18f1569c9b7a4a3a871f68b5cf3f430cfa34f0bf44489c2c63e77edd119d6552
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of numerous external links suggests a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zold-kommando.hu/files/relawe.pdf
    • http://aucoindeshalles.com/menu/file/68735930767.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fecf4c7673---59523458832.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc2f4d75fc---653590894.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5oljt5l88mkbsfbgldodjfgq5u/12551903788.pdf
    • https://gegeny.hu/uploads/file/42123063878.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/86869058150.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/biwajupujekis.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160832b7e4a9e7---34946237859.pdf
    • https://mwasafat.com/uploads/files/rasub.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f899e390f---wepabujum.pdf
    • https://go2germany.ru/files/file/pikiligisizesisawosobox.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/waxoxunuvelulij.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bc6b84f69---gidusujonerapowenexo.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31743b206---72681626288.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/2b763d765e82730faaec5fff43a59a42/dizatugejavozumob.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cff085f06a2---49250062723.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed03247ef1---54461836899.pdf
    • http://ackerviewguesthouse.com/userfiles/file/mutomub.pdf
    • https://doublehair.center/upload/ckfinder/files/14727813537.pdf
    • https://sankaibearing.com/userfiles/files/lubab.pdf
    • https://aawyx.com/sites/default/imageuser/file/timuwidevosura.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mr.+president+game+online
    • 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_off0000fc6e.bin
4637298a301e7493952c99411e2266124d1966b1c3ee838fbaf0ae8b752ac910
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 17252 bytes
font_01_sfnt_off00012974.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 16792 bytes
font_02_sfnt_off0001418b.bin
04b759a0a8104ded5b1c04e558d64a580eed6e401b69f7e5efac972e67fc4d54
pdf-font-stream PDF embedded font (sfnt) at offset 0x1418B 10792 bytes