Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4318395a8295fe4…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 20:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d48df7e8dbeca8b0f3ab3ba373484dc7 SHA-1: a1db5cac3ff24763b82f24a3f3ed089f96d459d5 SHA-256: f4318395a8295fe4dd9be927d97e995ea4262d401beb4f643cd8cde55cd4d581
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=to+kill+a+mockingbird+ebook+download PDF link annotation
    • http://nenorm.com/files/files/57161788038.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/36431520568.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/mevideb.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/xadoketizazajuserewetu.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/19480199592.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/bapegeviretis.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/9525267362.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/karororumoketomotefepidi.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/xolikeroneviwatazomexefo.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/97738274488.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/buvakurapijudala.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/52473332325.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/rejatuguzavi.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/76379307819.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16136d08d847a2---xofazejewadanutidebeb.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/27180769265.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/zupozonafafef.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/80840657591.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109051223009029.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/mabir.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/5972019372.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/salerogudenob.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/06f1a7c5a0224c2f712605741dbde252/24515900994.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/12e58adfbb5a5e3a467646274e11d4d7/40405812890.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_off0000b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 15076 bytes
SHA-256: 182dfb9ff1368827383910cbfee17f83cc6d240bb0faf5cef15b331b439db46e
font_01_sfnt_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 10728 bytes
SHA-256: 545223f86057ceac9043e962717a6fe73467b77036856fdb6a36196e54cc8d35
font_02_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1