Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4515c618140a3f…

MALICIOUS

PDF

87.1 KB Created: 2021-08-10 05:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 357ef25df8a8e7bce61224a81ed5213f SHA-1: 0231798223106890b2b150574e71b594ca6f86e6 SHA-256: 7e4515c618140a3f8745099246bb928a75ed33e2e63a46a5c478ebe88e273310
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9679795c568f0bec9d805483dee6d5c6/xusoxikuzivawejegezudibap.pdf In PDF document text
    • https://anjingliar.com/contents//files/4022922530.pdfIn PDF document text
    • https://anfauglir.com/images/file/78305130515.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a398a66f579259ca3980293b8ebf63e1/luzawo.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/rozoge.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/78034052168.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/77607988820.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/wapufubowaxofez.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/gemanalo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41bdf93ba7---walakiw.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/98347647675.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/28332298132.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/28611503855.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/gobirag.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160820fad7d22a---82724254371.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/kepajin.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a301245886b---verida.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65846cab21---20742291604.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b0e983592---xuroviruwumuzaxukijejerop.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fe93a157612---52172007942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=factors+affecting+reaction+rates+worksheet+answersPDF link annotation
    • 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_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 17512 bytes
SHA-256: eb53c3d80f138ec3e3c6b9be47bed1fcaf05ade5c8ba9c0062630526378a2062
font_01_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 10724 bytes
SHA-256: c144a0d3a399c1dcc73b1bcd3b0e59cf6cffbf529b54331f21b7c6cb7e972d67
font_02_sfnt_off000135fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1