Malicious PDF — malware analysis report

Static analysis result for SHA-256 e751a39f2d9510e7…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 02:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c969a8d1a08504e4c468c953ddda6db SHA-1: 39dabc68d7717aa555de37720df845f617f3a527 SHA-256: e751a39f2d9510e7f895192eeeb5c9e66f48f80f904343acf2fbe0341eb4d302
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a large number of URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=the+complete+world+of+greek+mythology+free+pdf PDF link annotation
    • http://razzledazzleevents.in/userfiles/file/12683940710.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/22916664203.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/jikosamune.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/57717751670.pdfIn PDF document text
    • http://jarosi.hu/files/file/zumotobo.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109070756013434.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/86070583140.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/vegoxusajolanovuk.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d4cc522b9---53560126199.pdfIn PDF document text
    • http://hidropro.hu/upload/3163210509.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139845a8ed1d---14420489226.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/xefizenefegidagomoturir.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/51541914866.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/tanuvuwivibijeporalijodu.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/gofutizepufopudisujo.pdfIn PDF document text
    • http://hotechike.com/files/files/safonaruvomotofavudaka.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/39f4md0suih5j0ebrj8ng2p545/64354103362.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/xidenojobomigi.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/7592786253.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/faperirevizobenanapoj.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/balofejaw.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/82507071934.pdfIn PDF document text
    • http://freeorden.com/media/file/ribalu.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_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 18192 bytes
SHA-256: 90168131e7e1497a907956bf65972f8fd9559bcc5f586f12acbb07ec58ce2c09
font_01_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 10796 bytes
SHA-256: 43504547cac4464bcfce376cd60639491d7958a914d2a0c3d9a79b0e69b2792f
font_02_sfnt_off00013325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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