Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65114c89874c1d3…

MALICIOUS

PDF

84.3 KB Created: 2021-08-27 07:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b72cbfea394db02ecafa9b8086a99d6d SHA-1: 8e333f7b8a9f01364235261924127b7fbb46ddcf SHA-256: b65114c89874c1d348e0f2ce5ff6273da3a3b39ea81bdee117ba2fddcc7c1865
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit vulnerabilities. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d764a726b0f36cedcb2baedd5aa6651d/66204569476.pdf In PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52cabae9a2b90deca09ae22583540558/tibulesusutilevorufamola.pdfIn PDF document text
    • https://laps.pl/userfiles/file/rutetupeveramebom.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9c1c557590c2ce5c5a783bfb30a12338/kimosusel.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/761bf3d99cee54327ba81808e82e4d6d/44882580834.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76b1d1b8d6---14128151326.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45b57cc611---xezakeritalevuram.pdfIn PDF document text
    • http://allycatering.com/userfiles/sedofetanokirunuwano.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f333c07d---kedamaxudibafumufuwenila.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/wapuvarikaxolilixileb.pdfIn PDF document text
    • http://chromoink.com/updates/file/givufelaxakujazus.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/91676001057.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/16c927ffcf9f21b3049eab3833863cc6/noniligegamelu.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/irn2cntgbtlilmrqbpb5p7matr/nabanopelenetolo.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/lomiropopikasipak.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0871c1d500fab7930bd96edbbf4f213f/pidomas.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/joditoj.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/14623189036.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36275edaa5---negojeragavazirigipa.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/51481590322.pdfIn PDF document text
    • http://erex.hu/upload/file/dezefibumegera.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/82c49d252cb23cc6142ad965d8fe22cb/62911520198.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cf8c1f106---86776605817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=spinach+and+feta+quiche+with+puff+pastryPDF 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_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 11072 bytes
SHA-256: 93b2064eb724fb37f43a0b0ad4bb908c5590043717a2f55b4aacee84ca99823f
font_01_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 17392 bytes
SHA-256: 7c23da79404c3d85658d5a66268d3758a3d6d24aee9db08e011755e5e9b0b78b

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