Malicious PDF — malware analysis report

Static analysis result for SHA-256 317301dfe4728fb7…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 23:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba24d7e24b4feeba5ce5b56b6f718bc9 SHA-1: 93b732c63c3d199009bd9618e1d14f6784f32b32 SHA-256: 317301dfe4728fb748d297a478f6d3d147571b416405d62fa98adc14b491c539
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised websites. These links form a link farm, likely intended to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://muzeumostrowiec.pl/obrazy/file/fizodib.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4c403390e2198f68fabc41b7aae2f273/ponusavuxolisit.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613676d2f41ef---39805164619.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/29629924348.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/91c11d79acd042fb022bc36b4cd54fc2/xezetuvavotimabinobav.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/zamefavoxitotifi.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/98106371893.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/6598743739.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/70664437433.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e15419f6---83701406312.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/12263279767.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/puliza.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0b9c76e8---tawona.pdfIn PDF document text
    • https://premium-house.uz/images/file/69470028918.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/15925185574.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/pewavezutixogid.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c24788431f---45828754370.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/31831486022.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/boloburobirirutifogimat.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/64317214000.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/kepejonumigogepopexufad.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/zikudegubilotijajeloloze.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/98984992282.pdfIn PDF document text
    • http://ranjoysarkar.in/FCKeditor/file/21491381251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=get+someone%27s+instagram+passwordPDF 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_off0000bf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5A 10848 bytes
SHA-256: bd476fe659c2fb049fef25bf7db76a9f469e4d6538e31216b9c5c39fbdf14380
font_01_sfnt_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 18392 bytes
SHA-256: f1f643ed3dee497c026473e233c0fa476fb6407fd80f7bb96e1af16c3968a67e