Malicious PDF — malware analysis report

Static analysis result for SHA-256 747c85b05a743c23…

MALICIOUS

PDF

83.7 KB Created: 2021-08-27 21:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6dc192cab45fd2de53049d7bc963922a SHA-1: 504bb1b2f2087e02bfa7557a758c4c69d164fe3d SHA-256: 747c85b05a743c236569e85cb4be770c97a940ca54dc38582b970e6bb98d5603
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://artenika.pl/fck/file/nojikusilepem.pdf In PDF document text
    • http://abogarestudio.com/userfiles/file/weduxotixolidupawezibepud.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607047ee4aba4---15430287820.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/21335297558.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/ruribuxifotup.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/xopoxepugivixigot.pdfIn PDF document text
    • https://baongochoa.com/upload/file/momefakumevetifuwifo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c568a94f71c---dinejefasenugonepaberugaw.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b955c38737---4030901228.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7e886cbd611fc374d72f0962f93de6c2/19848335709.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/81687074245.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/jasixogugujajezimesebamaz.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/notaxiga.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/jitibedigafijavazinakosag.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae327d18b---tijuderoja.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/46346703327.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4e4ee31e---40383498394.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemaratenefajawazamegoser.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c845657ebcf6e5e0e75c00f7001593f2/99268018511.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/op8i11ptl32g2jrk0c99ihhr4b/38747312738.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160787ed373df9---lezomivuwomudurovugu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161106d9d7c6ab---68932118719.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16233053460191.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d0d30b0b4---gukafube.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/12887356036.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/91548229974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gl+tool+free+downloadPDF 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_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 18688 bytes
SHA-256: 9924d95a6aa1ff5e991e8bf904302cdee5506727a78bfa39a26b5cb1fd5a1e94
font_01_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 10212 bytes
SHA-256: ada438fb3f1d944a0cb4b06cfc8e048e6898c29da33b5b836b933bd3220a393f
font_02_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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