Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fd3b49c9374dbb…

MALICIOUS

PDF

94.0 KB Created: 2021-09-18 21:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c5918bc896b9972dca009b2f78d2e2b SHA-1: 24106e013ae031adab8ad8d6305815b3ab3411ab SHA-256: d8fd3b49c9374dbb7cd05c7fc416b039c4a31bf31b1b1c9d3b163a7a8b5fe893
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely responsible for executing the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://bc-arman.kz/ckfinder/userfiles/files/53708469081.pdf In PDF document text
    • http://wonikquartz.com/upload/editor/file/1630987058.pdfIn PDF document text
    • http://rayanchem.com/d/files/29583368595.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/38719823652.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614138c7bf3fe---46817316088.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/mijarakikenuroz.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/fitobemipuvutopuduzup.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/dewowakokuletegi.pdfIn PDF document text
    • http://huiking.cn/uploads/file/050447243361.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133358777457---zuwimuposoninokojaji.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/vigenolijilufake.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ss0kpd71kaa5shkuuosl2f2ra5/zekugebumugafugag.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/58280744217.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/66118579746.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9109e2c66---19839671020.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/60985625437.pdfIn PDF document text
    • https://online-wums.com/files/files/loraletubogukoke.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614553be6bd17---xaxesitik.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gumikadanes.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/15963595050.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/53669184969.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/dusomemosodomatozi.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630510594.pdfIn PDF document text
    • https://derfo.info/resimler/files/48426900041.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/rumarerixuvofixuwuzamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sexy+words+that+start+with+kPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000133d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x133D7 18552 bytes
SHA-256: 934e5bedb2b76ae44e35a889d3505d74ec1edf2635ef4ad64d05c9ffb9111198
font_00_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 10664 bytes
SHA-256: a1cd0b5c074548b8407fa54d1b63537c8da7c3c349641672a2853850a147ca9c
font_01_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 18036 bytes
SHA-256: 171e4407b182d63585848881fbb5de81671c067698716e4fa207bacd5c293b85
font_03_sfnt_off000151bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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