Malicious PDF — malware analysis report

Static analysis result for SHA-256 852146f963d1fa76…

MALICIOUS

PDF

86.4 KB Created: 2021-07-07 23:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 91711487ca80a31a3abe4389e8634a3d SHA-1: 32a3679aaab7d5193c51d69d0cade6e66387e580 SHA-256: 852146f963d1fa76fceac0c8c3ccb8baec8be4aec5458e249efcfa085d3e7cca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to host malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606d82e9151bc---rokuwuwavurogebebapodojog.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9cb5a5d2---67061443821.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984ba423fcb---13692988731.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/41808520424.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/97925804244.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6abbf3bc0---83096892393.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/dibukasaziwudituva.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6sd2rol6e4qionndmdl5sdfsg2/37006153203.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05bf3b84e---zatafoza.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/21140623034.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/93361623124.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3061129b---25607371884.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b93e73103f739b5942c45388cacec752/31482820474.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c7b1247bf---78278867405.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db73eb3eed---gewabigudazidof.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c4fc5bbad76dd4385da37252dee339a/jokezimofe.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jdp2um4gh7b17tdfpidj92641k/24461607331.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780c16975c8---fijirejodevaxizaba.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1c51d00fb738e00f6991092eebeb8fc7/zatokowen.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/geturatinizixomabexapop.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/51431056789.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/487135924.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/nifafujapepazexo.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/53684683948.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963748d02ff---pobetelajipedepiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+address+envelope+to+apartmentPDF 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_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 10604 bytes
SHA-256: cd85f8ca4614c5cd1f9557aaaad21922525a6bb6cfe25ac8cad50debd94b135f
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 17028 bytes
SHA-256: f73d7e3cc980a8a5951e144847b110c7191bec92b85fae0a030c0ec175577307