Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a936b53d6be26c…

MALICIOUS

PDF

96.4 KB Created: 2021-06-13 03:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8b1a9b638c2175c46ae4072a2581a9c7 SHA-1: e19dcad1429209c1580eb42dba425d064d29330c SHA-256: 41a936b53d6be26cf9ab513b24ea0e2cd46bd961f8cc6ff3299fd246fae22a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting it is used for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cructi.ru/uplcv?utm_term=ishti+kutum+star+jalsha PDF link annotation
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b050307b005---76231867136.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/780a22d1b91de8d0898245c7fe320599/207225321.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160968c479ade2---69518397351.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4bb4c6d81---86721948743.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/eaed4cc15735187fb5d87e58bb265c1d/70815207561.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4c80aeca---81715694254.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160872cf4d060b---zojugerevoku.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54fd29d5d1---bamiwitujemovuruwod.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/52416013102.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ad7c22f8---wirofetumukagovir.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lmvetff2eaej7mh097uhva76pt/sugufe.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/m84djhu617iarthem4eu04sc9n/50399462008.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ab17bad60---92653229883.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/75595940145.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4kofq9rnhfcgh2odjs8010sn8p/25254722525.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 4552 bytes
SHA-256: db27c7bda25d3449edfbb6ec5d0f438536db2c18c8e0a66d90cfbccabe79e5d5
font_01_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 3256 bytes
SHA-256: 7088ae7d06695393827eedb1be8235c1b4f2875ab358b585933e8288363aa3e0
font_02_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 7984 bytes
SHA-256: f61546179c80f9b8e04ddf7569b59fc8cee4af6bc636eb047f4899220c67101d
font_03_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 3436 bytes
SHA-256: 5d04d3fa384c15f11cd9124124611e5ac5898240a523d4fa2f211132360a833a
font_04_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 12488 bytes
SHA-256: 0bb8fa2dd44fe1d0ea63fc6ae70e733d8f1e452d0729798158aa2791f770b5a2
font_05_sfnt_off000158ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158ED 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_06_sfnt_off000166ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166EE 3012 bytes
SHA-256: e436a08565f1b33be122f4b63f218e4971c5743d59a0ad36c689f909c986e7f0

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