Malicious PDF — malware analysis report

Static analysis result for SHA-256 49728d121fd4fac3…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 16:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bad25bd86d5ebfe4bfb54cedb92e4ff SHA-1: 92c1568a5d451d1820c92dc5f313529a53afb7d9 SHA-256: 49728d121fd4fac333f1f2f8dc75188c0d815e2acd7d8686d37dd310175cc706
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://drafthe.ru/uplcv?utm_term=art+of+war+legion+apk PDF link annotation
    • http://yushendesign.com/images_fck/file/1631158693.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba52778c4---keben.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/larituguz.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/9777032323.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/koxatelatikoj.pdfIn PDF document text
    • https://polandpools.com/contents/files/xewabafo.pdfIn PDF document text
    • https://linardi.ru/files/file/69082289360.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/burafekozasutuvomajopip.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/18694555070.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/73622665363.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8f2ed65c---2926130596.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a8eb8e97da3cdadcee13138ab3cfcd3c/dazilawesitonozenoja.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/10789617581.pdfIn PDF document text
    • https://laser123.com/geektic/files/58090704607.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e7adf69eb415e4707f46016902f6a9e2/kozari.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090723162125530.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/simujapun.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/34595773583.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/81517883555.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/79652602417.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143533d6f56a---pupugavinubewebimapupak.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/runivajugigegowutetedupu.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/wesezisepafirokelazopaleb.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/8388910669.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/gabajizisuxom.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/zajavutorada.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/55806936689.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_off0000c1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 10524 bytes
SHA-256: c327d2245cb0519e0c7476c52298a0f5f49e46f57ff92d8749882127e8691655
font_02_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 17604 bytes
SHA-256: be7620d103d318925e25bfacb718d9e32292da8edc0c77eb189cf99bd0135f68