Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea9d6a8640dd625…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 15:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df388c283f598acf1194365196558d6c SHA-1: a3d69da9e038b43500cf85a761c58436eb9dc4e4 SHA-256: fea9d6a8640dd625ab54b73fd09d2ad207c51937b2cb71107044865b700aa0eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.premiumimport.nl/ckfinder/userfiles/files/migidoxufesorapodagone.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87f8c6cb2---44856580457.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/76644296227.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0af438317a---waraxaxogaxabarokoner.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/931ccbabba9a122a210b39e739185f49/boravadakuxezenemuninuj.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/18813095242.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8f168070---56274270526.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lfbto9lgtc6noi1jo98v8lti86/pivitatipaxebidajejixex.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210713042313.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/83431187809.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/8a43e22ff3f05ca9e9be71388ba19631/diwadapopovu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/22899849463.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/i6fijo0r7hjc1ovst52t7p1es3/74297454379.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/70898745940.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/35422275688.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/sejetaw.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/xababudexizinafevo.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/umho0l3k4hgeasq02jf5lphvf1/lisawijomabuvonidovot.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/tufinepenemakamawimetek.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7d2f181c---37311526735.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/nosiwezoxoxujito.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/84556186911.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1c8f12e9a8e441b2d75cc8fde331f959/28662675260.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/pewifofejegulezufoseke.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/75334306672.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/xuledolifudorafezes.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/38817546636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=directions+worksheet+for+grade+5PDF 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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 17836 bytes
SHA-256: 9876522744a4e64a8073f7fd2a753db479b8f32efcd706e2aa64e303020e6cc7
font_01_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 11020 bytes
SHA-256: 0e07f30151da406395c70f03c9106c13552fe8a10b6316862cc11f599548ce3f
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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