Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39ac6cc9da36438…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 16:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63aadb7d9d2cb8883e5de15644ba9fc2 SHA-1: ec77f8a71cd519ecf32c0500d71f67261e1e72af SHA-256: c39ac6cc9da3643822f5fb7ba20949ba09a1aee1f71b5843228c91e11bc7c5aa
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to redirect users, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=the+hidden+life+of+trees+pdf+free PDF link annotation
    • http://eggtesting.com/admin/uploads/file/jalix.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/48370154759.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/8695304818.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/sojibinosa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613127cc5317c---nanakizivebojaforazi.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/woxujesiwizogutozaz.pdfIn PDF document text
    • http://ropesadventure.com/d/files/60538300951.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc26cd1892---52702038412.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/numapojigowedotafimavopig.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/81147162012.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/derijazafenuzanutajufa.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/48878980400.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/64011249634.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/74370073421.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/wunagiw.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/pibubiw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9da0e2b98---58811945664.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/vaboxevijakona.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/leguwepijosomalub.pdfIn PDF document text
    • http://twilaw.com/files/files/durunizewilupu.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/novamigemipisuze.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/75233300947.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_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 10396 bytes
SHA-256: 6283aa7f6393101238df19d14be82cf63c3575c03ae7875648e5498c673fbeec
font_02_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 16340 bytes
SHA-256: 9ec9c631f423f80249e357932e648c4ca2de4e0c49491d9ca16ee7fb73690c77

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