Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6ca30ed4130efd…

MALICIOUS

PDF

90.0 KB Created: 2021-08-17 08:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad3403a21a92e0bcbdc83cbc63d1c5db SHA-1: 7dd77cd5164abd4177c75dcc38fab6242007b2cc SHA-256: 4c6ca30ed4130efdcc1df1c63ae013f3c2687c5d2d5a8d2fba9fea5c0544aff1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to manipulate search engine results or redirect users to malicious content. The presence of many external URIs and link farm indicators suggests a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://laborke.ru/uplcv?utm_term=it+all+adds+up+music+worksheet+answer+key PDF link annotation
    • https://unosms.us/userfiles/file/80805126344.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/sfmvoe17vg6tnbt131t7d0b8r5/kosamefumilisavuraboreros.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f5fa9110---69451225412.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ca409239---wusubuzuwotavopuwimu.pdfIn PDF document text
    • http://www.celso.org/download/92253405211.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/narewi.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/39277595847.pdfIn PDF document text
    • http://e-sportis.com/images/upload/77437915373.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/16130484224.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/41347254497.pdfIn PDF document text
    • https://hoalavender.net/upload/files/laporigafegukus.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5ec42660776d36036cea36db43ee925d/muximizoxudi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/mobojezekovijupudedobure.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kumoz.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/12523959058.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/89051812984.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/vosipazawolegobakogedime.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608afedb801b0---tuxebumik.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/87967284776.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1e78a04c2---bilopar.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/efd8de7094727940984c400c64c0bac6/nazexamamawuzaxux.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0278d133---64872165297.pdfIn PDF document text
    • http://npas.ru/pic/file/5734901707.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/93110af985ba86c41ceca4ddbf933a5a/zawimojunatugawoti.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/58145946713.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/48ff45f03ccdb8a3c71a4e3813f900c7/9694298614.pdfIn PDF document text
    • https://bursac.net/userfiles/file/89070651203.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f3f848a9---megomujumopu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 11120 bytes
SHA-256: 565af3776f5f443542291011fdfcc17ffa37aa951668cc4d9806871b61fd5a39
font_01_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 17588 bytes
SHA-256: 7559ceb0831641edff640ad48defc228a40e1d9b6066c46a56e1bc74e97dec5d

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