Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1cd5f74df397ec…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 20:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dd9a65a49b63ab01acf213a0eaa5f08f SHA-1: ec41ea502d2490ce26d7712ecd2d1c81937b7c87 SHA-256: ef1cd5f74df397ec4b72766b98f32b1de15d2d4dfc962dad32606725ba1825ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file has been identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, presenting numerous URLs that lead to external sites, including those hosted on compromised WordPress installations. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.naraihillgolf.com/admin/userfiles/file/novobigemetiriratif.pdf In PDF document text
    • http://m-s-g.ru/userfiles/files/65315295446.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/gurelunelibanipupu.pdfIn PDF document text
    • https://mmszke.hu/files/file/kozipenedugag.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/56254914471.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/zexaxujojituxilob.pdfIn PDF document text
    • http://castel.lu/userfiles/files/xofuvitebitukilodifan.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/42550725509.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba76a5c4b7---72344872772.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/54381532553.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///kefojixixokuk.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/67800193947.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/fisikaminoliwim.pdfIn PDF document text
    • https://artbynela.com/uploads/file/37914042048.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f5efc4a3ae1494f851fce410b5bc1739/65948732502.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/46668738100.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/mevunegowororosijafipi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b45a68fc9---xabadetikutuzuzemuvinej.pdfIn PDF document text
    • https://activepymes.com/pub/file/74472497154.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/39295187751.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/36785894084.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab6b02021---82834137929.pdfIn PDF document text
    • https://glozor.com/userfiles/file/sivutedefije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apk+open+withPDF 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_off0000ce3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 18304 bytes
SHA-256: 4e8c5b60eca6ff5c98c6d288cdec0455785e78492b97a28b6009eab8412f0053
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 10032 bytes
SHA-256: 2c84aa5700960c6251a1a885f6b7149f468884e4061d9638fbf53c4f4a723aa4