Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f8b005ad79f777…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 03:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6104314600d805f01df81f88bb9e90ea SHA-1: bb7d30c8ceede0ac8b8c2ae3c7a039284572a3dc SHA-256: a0f8b005ad79f777d85b5ce667c677d965a499ab6914046c052a5d78e72e3eea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=windows+7+live+usb+download PDF link annotation
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bnomvkfa9hgmarvnh28da8hdti/73204897960.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/sdvcmt3agb6lo2n721gqr0ke73/46091126818.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/37957976518.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/2777651975.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/58289206601.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b4d43a1e---44692090393.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109081002044141.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/36089797088.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/safikelekulelejaruzuxene.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/70648666242.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/93446527682.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/vedalekazexoxe.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/tamevadudoxopakivawixixe.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/43101173719.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318486ec0cc---vufaxuxivanuwugazupapi.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210903103005.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/69436949105.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/makatopap.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6ae3abd0---kosujafegotinozovekego.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b7fb2ede25dd1ed278a91ce9abedf978/97793078141.pdfIn PDF document text
    • http://chinalabware.es/d/files/bajidulezetubunabak.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea886b9312---xivolekutagudalizajeleju.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/tepejorokuzavi.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/pisimetekefu.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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 16368 bytes
SHA-256: 385651a0690406736c234687dda069407a526fd442edde1fb1c9aad46b9c99be
font_01_sfnt_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 10480 bytes
SHA-256: 6e6b46e28e721cb5668432f6b9191c530722b3b4b8fdd81877820578af5394b5
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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