Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb79236bb5f624d…

MALICIOUS

PDF

81.7 KB Created: 2021-08-16 23:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b4913a6b63c7f0f33aaeffbb7f95018 SHA-1: 620198a27bd2e35ea8c22fa2ad0c789a5ba4eea9 SHA-256: 8cb79236bb5f624d115c0011baade554d90479a405ed1ea36529566adfdf67ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites hosting PDF files. These links likely serve as a link farm to distribute malicious content or redirect users to phishing sites, consistent with a spearphishing attachment attack pattern.

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://queure.ru/uplcv?utm_term=molecular+compound+held+together+by+covalent+bonds PDF link annotation
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9efbbe1c---fudapat.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f206f18a---lodixurebiwabav.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f51580d8774---zizeveburiju.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/kavaradowegujitageso.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/pagowikexote.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/pusatamikejebepej.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/89547658745.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d36dd237e6625f1bab50afb7b01639de/39845580318.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/razijulobozisibuwama.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/divuram.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6b0eac23c---bikokezijaxaxa.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4dbe087af---9217145982.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/zitekokidesi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7pmcgvlsu3rjobklseh3qb2vjp/kutivawodinizofozanugawut.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f4fe1d14---didopuloburapezedarob.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce737b78d9---14964127568.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ab083b17c5085c970f4e427f677495e3/dijunofoberoxokexej.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/87813218501.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca981ee223---refufobenisen.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ipf5qe1s2pj4qpcu6v5mgvsftq/90243678451.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/nozawojijolufa.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/riwolubavafalafexugizogut.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/pa3g1e6s9gii7rsqp7bp6rpo5g/modaroseg.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3b99b320---75613934786.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608172dbbe5b6---40901287411.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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 16852 bytes
SHA-256: c957d482976e995c9a2e41c7c281aa099561d47b046b769218dee672a96a8c7b
font_01_sfnt_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 11280 bytes
SHA-256: c428907202f89cca94113fe9c6afb2117eb84a90aac2a5b4452d87be11f02ddb
font_02_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.