Malicious PDF — malware analysis report

Static analysis result for SHA-256 d349d0fe80c98ef3…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 03:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba292c84f7b90e209d1a5b94548da5bb SHA-1: 8e70be8ab563a3d5de5b06037a64eda8973dae0b SHA-256: d349d0fe80c98ef394735f49307c50affde5f95d9e43f6b0d1558b06a7f4f247
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=linear+equation+worksheet+doc PDF link annotation
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/fuzaxidaxux.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/23598379423.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/zirakep.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/70888772400.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/50488986808.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/jijipuzakaxalobanuxanenuj.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/vudasijimikapo.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/f5e40bc71afd1c11db526641f7f1f567/22762963735.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/71292756245.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81496ede2f0fb77015a05c1e49e168b8/86358928240.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/49817893393.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/35697177756.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/fudej.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/vavixabenamapelanarev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f000edb7a---35164414021.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/3967094416.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/6084923638.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/17317475665.pdfIn PDF document text
    • http://micruts.org/userfiles/file/wupujijakurirubo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d65980cc---xuvazividaroxux.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b982b005be0---kikakixowonovas.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/wuladeb.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_off0000ba44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 17448 bytes
SHA-256: aed526b53d78e5f2ca9b759208faa0ecb0518f44134e265a72606294776ddfde
font_02_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 10804 bytes
SHA-256: 2c5cc6f063507712267b8a8488a8d1e18b7d2cb288731624496ff5bbd8654591