Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b156871832f52f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-11 11:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0abce9ea3ff0c575e83a057fb415ad9 SHA-1: de04f8cfc5dc3975dd35c1011b7d2729e4c0f48c SHA-256: 86b156871832f52f9d81bd8d896cf00d233f311fea1fad3287807948796b9f1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of malicious payloads, while the link farm serves as a lure for users to access potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=street+football+android PDF link annotation
    • http://ambulanceservice.pl/userfiles/file/xojawirefaxuvipexuj.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/rumibukenusuguferanomux.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/fokaxo.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/wuzadariw.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/um3bovskfgcfh85ltefd5hd3rg/36325842790.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/26171987271.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/67026518405.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/givexiwubasirevobidepipam.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e83a0008---58983405538.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/32835348689.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/fibosuvodimisomi.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbea57976d---kelupizegavufomiwuj.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/safivudedumofozaluza.pdfIn PDF document text
    • http://polkovnik.su/upload/file/basovibir.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/3954676900.pdfIn PDF document text
    • http://newshop.jp/archive/file/xadaz.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/8853675551.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/sapawugolebavi.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/tezobolopobexikilusozomiv.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139507fe5b50---fojopovap.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/kegesalolebolanoxiganu.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/mejefe.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/dapopaxikazitepozad.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/50014650744.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_off0000b59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB1 14472 bytes
SHA-256: 3a0a2218882f8c6687410b8b07470337f163734fbf4fb435fb1860600409495c
font_02_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 10396 bytes
SHA-256: bca966cd20c0cb47e3b0e5d8dc5348672105d774394cf3051654e5e7a8b5fffa

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