Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d29ec134b9132f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 10:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a4cdcacbec8a714164e45df0f0736b3f SHA-1: eb7ade460ae6faae153bed244a37f94160010f21 SHA-256: e7d29ec134b9132fb38aa6f57c60b6297632c076425a3c362b8334e279eab35f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to phishing or malware sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://okna-kursk.ru/page_edit/_samples/userfiles/files/sodewu.pdf In PDF document text
    • http://www.andreapondika.cz/file/41239019658.pdfIn PDF document text
    • http://technocom.pl/editor/file/62702921646.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/14609350694.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4811667ac3af00727357d966cbaee6e8/lujez.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/kopokitalidawaxi.pdfIn PDF document text
    • http://www.f2dassociates.com/userfiles/file/zobixega.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/puvefapas.pdfIn PDF document text
    • https://kueapem.com/contents/files/88229439782.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/49104213997.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486cbb4ba3b---kawazatifefafebeb.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210924131205.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0gb8ui6tvsmlk6vq4ibbtf81ao/xodanasegedezopale.pdfIn PDF document text
    • http://phongbepfagor.com/userfiles/file/37674266658.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/pelinut.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/82954583420.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0493f9f97bbc172604748908830cca03/77177869667.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/53586388745.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a606d1580---mulurawuwebolubenebinu.pdfIn PDF document text
    • http://sireny.net/share/files/38394207640.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/5219308422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bike+stunts+3d+racing+stunts+game+free+bike+gamesPDF 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_off0000b0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E3 11208 bytes
SHA-256: 0a2a1fad96110d182d8678a8a273d47e751c47c16f8a6d5bdc5017d4d1642368
font_01_sfnt_off0000cb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB02 16864 bytes
SHA-256: d5366563ace065ece3e0b2b0070e94f294f1b97495f14c1fe3ddbe8e2fa96ce9
font_02_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1