Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1134a6ea68c749a…

MALICIOUS

PDF

104.0 KB Created: 2021-09-08 11:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a72754f64f4075b6b0bbd8b3acb19a7 SHA-1: 70f9616016fce419fcbc8e14dcff154ba1ecd5c6 SHA-256: c1134a6ea68c749a84d9b8bebdbca8006db330aafd321490987e491abd02c6e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=finite+element+method+logan+solutions+pdf PDF link annotation
    • http://buydecor.ru/uploads/files/53976484662.pdfIn PDF document text
    • http://salkim.com/userfiles/file/28264691674.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/v2n6lg2qcd218o6tqtkkmajaek/tatobirizasuwixu.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/dekoduruno.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/47400450817.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f0517f420f7---delifetutikelabobubipeda.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160704f9a706a9---77392518740.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/86243854113.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/tagelurulozadu.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/kererazivodemiguneramoti.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/jigabexonifuxexitiguziko.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/suzorufesusutezirovutor.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/87239813753.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/43395619103.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/oijob52vc0gie836kan11th621/vopetesorepepadokuvufa.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608616feb1043---sunezu.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/1sfthk8eitk14bomb5frj1q66g/11039840372.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/zujovuvilujug.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/br20pj7bcjq67baqpv6j7fs78m/98388365618.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/dusanugotugujozovov.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1bf180de8---jatajos.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd57f5a1c4---81980290409.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/4aa731fc374a04cc5a5586b5193b9fae/dojorunozi.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001128e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128E 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14179 20676 bytes
SHA-256: fcd6c5ba506e1355291705b8490b66a82e1db377c183278b79cb8ed01fe78543
font_03_sfnt_off000178ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BA 10924 bytes
SHA-256: 82b9ac6b16ab251f9886b49edb2d8d10857f3d32cd279f8641d8e0bf20d61ff6

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