Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6d6d4ae153efa4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-24 02:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed82d207540db89a8e9a6e2efa0f251e SHA-1: 97cb5845de44b90605d4ced5cf9c321244d0a658 SHA-256: ef6d6d4ae153efa463e9b95a3fb079fe902a0e6fc45aca2366ace4d7fa94e3a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=telecharger+application+viber+gratuit+pour+samsung PDF link annotation
    • http://gold-carsales.com/js/upload/files/fezukusoz.pdfIn PDF document text
    • http://uteambio.com/upload/files/51728515979.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/gomeralutokupupomo.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/56902571858.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/91309829714.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bc05d3014---21722141898.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/20631942332.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb64c38c9c---pekenagamiluju.pdfIn PDF document text
    • https://doitoutdoorz.com/file/8ZnrFEswO3sbwSVc.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/46992993671.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/perodovuzinup.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3dfa56da70c65f758ecc4ac61cafacdf/84651495087.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091117321173499.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b476d76b---zobekevege.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nojovidagefobizemubus.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143aed893ab9---58573426751.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/zirisokitub.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wibix.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/baroredujekoge.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/gixonodegidebibedogux.pdfIn PDF document text
    • https://pecsikult.hu/files/file/27324913404.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/jupidevi.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/47067394345.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/24051121818.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///dirojemipexelekometet.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_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 19528 bytes
SHA-256: 9a3b29d0aa8f465895be5249ecee6c6a5708e368648a091897f2b1fad4f5d677
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 11092 bytes
SHA-256: a53317b95d61e0bef656c7466603ef7b90ed0ff122f4f68a27cf851af3faa74f
font_02_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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