Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b7e0b146bfe915…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 08:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b216d904c06a1fdc02784f7383348169 SHA-1: 2503cca6b4c7e68acd6d576fb19db3c477de6d3c SHA-256: a1b7e0b146bfe915aeaca5df620ad77297b8b7dea8084848ecc20be759545e2f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://starinviter.com/ckimagefiles/35145030582.pdf In PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/sewogasoxufoxovabe.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c53d5d8f31120c665a748afbe3615570/jixoxegubodifutobul.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/dikokewadiruvugegited.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/puwuwuforipilurivutesofun.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ttph18ghngpdm1q8slnkgra725/delijumijotefovorapi.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/98735288050.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/74750742647.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d316ae9303e---jaroratuvadod.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56065610605.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/gopitewewegimaji.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b91111edd3---mixoxadebetofomuf.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/70664588237.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/68919081561.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/pogivuvewojun.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/nigodizal.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608257ca536ae---tivaselisegu.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/toloposiniwis.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47b7ce936e---46500868124.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/19783887924.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5keqmutpj09tcc1crarb3l85d6/giwakef.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/kekexomojatefigirag.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/63762951704.pdfIn PDF document text
    • https://yuss.it/file/53255399300.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/fomizomememumorizeser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cara+word+ke+pdf+onlinePDF 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_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 17244 bytes
SHA-256: 8604603303fd97ea876e31ab80315b13ac77bf5a17850ddd45875017eb4e2a08
font_01_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 10432 bytes
SHA-256: 29a240349f8b2082729626bbb5c604d2550bf93c8881d3ccd55f6999f2e3574f
font_02_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1