Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a15bc565834147…

MALICIOUS

PDF

102.6 KB Created: 2021-08-08 23:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05c0ccc0be60f49a6437db131416915c SHA-1: 8f4a84516557792cf584d77088d9cad487926871 SHA-256: a8a15bc565834147711854f215ab76ccc6e0cd507a179321a1631422c1e7a94d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to redirect users, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://tznjl.com/userfiles/files/lafekaku.pdf In PDF document text
    • http://consol.hu/images/uploadedimages/file/zepiloviwej.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/58316274916.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b630666b1---400966764.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/726qf5vf23kf82v349hurpu5pb/22245161741.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2546e0d9ee---kaxodukaberile.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/17356508895.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ivkhs9br992itdekp0ao0qssbc/22713305024.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/bdf7f34506fa3f1cd1f5f1c5834d4ccb/mobevoxokazebasev.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f086147c15---mepodagolixojurapop.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/n9ddtk6raf8jf8hgm1l52pavle/lowugeserenel.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/laxef.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/xugifefe.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/b9ccd5ccfaee58e2ad3160772dce590e/lomosebedisafasozov.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffe9818a6---mizan.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/nabotor.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/10783116375.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/66466869741.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160797ee6018cf---51614691504.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c53a11e543fd2a56b1a0485c2b3af492/visef.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27dce74285---kigapizanolij.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/fedevaturupodeduga.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a95547d80---wuzisavasupegugesejiz.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/gixatemosatotosopujemusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=que+es+la+manipulacion+genetica+clonacionPDF 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_off00012afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 10776 bytes
SHA-256: 2e9908ad5f4ccf4a0668b56f9b095da8ca7a4eee05ef296329aaa3d677787005
font_01_sfnt_off000143e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E3 18192 bytes
SHA-256: 35dfa11e1b22951e260ec43fface0d27a8a97772dc511508f7037dd9d82cd673
font_02_sfnt_off00017247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1