Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da4c86d6ef7cd50…

MALICIOUS

PDF

93.1 KB Created: 2021-08-07 14:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e02c877b8513d1c0c289742df12af423 SHA-1: cec0d9cf7465bf53b4e6de020a03b9ba74cef5a6 SHA-256: 7da4c86d6ef7cd5046f471d2fe10809d15df55630b2c1c106361cda0ef202c49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=youtube+%C5%9Fark%C4%B1+indirme PDF link annotation
    • http://nuraski.pl/wsg/userfiles/wenokukegimikuzojamexufa.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb94674cec---sifunokababuxusubus.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/3472237616.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/magitotupukem.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/nuzusuzefuvalowu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ae3dd7fc98435144db19958f1204beb3/9623409762.pdfIn PDF document text
    • https://susta.vn/userfiles/file/49299137113.pdfIn PDF document text
    • http://k1a.ru/images/files/file/79599180582.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/hiol1t4htjoqgg6f6uhch1rkd6/vekizu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3ba00ef0efc3e93b8e52ccb4b250453f/figedapupesexix.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/mepuwedadavoxipof.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210718_B58C4CF88FFCF15D.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5f24215bfed4be3c76e4f2841b59c305/84936872105.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/zebijoxopogasanozafi.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ob9smf897b6f7vkr3n2ja1su10/82018553075.pdfIn PDF document text
    • https://digireg.dk/upload/84734711874.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1dcb13a6e---47615062357.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/zejem.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/96753152122.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/37328511739.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/sebonatenig.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/17261337298.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/sabufufuzabuzenida.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/larukejumanifawuzeto.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/89005479749.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/82640169255.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f8076b71---85224159264.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_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 16084 bytes
SHA-256: 169060ee3d4a28e10bf8902f35113a35e3026fe70e7561f94e8bfa04626d1e03
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 18832 bytes
SHA-256: b2b530bdd12ffbc2ea3c6f4c8e49f415271b6ac671be19ec3fa125736cba08d8
font_03_sfnt_off00014ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE8 10796 bytes
SHA-256: 46dd794e28b2abdf1cd3d976d269429185c34b440569205b7ff6e7626a0d1742

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