Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba23d53598023f9d…

MALICIOUS

PDF

70.0 KB Created: 2021-08-27 22:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f95d829dcf75599f2d37c81dd49008e SHA-1: 406dbfcb17e834ff6b42bde56ca86b5d26dffc65 SHA-256: ba23d53598023f9dad3915ffc49bc3f57b67625fe7219533e4fea87ca809f9d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple URLs hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are characteristic of a lure to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb29b522ff2---zimagobokij.pdf In PDF document text
    • http://burchiellati.com./file_fck/file/23902106393.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/jarugekuloxivo.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96fa57282---15306487579.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/lilixuwilifeka.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/50600952227.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/1720126155.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/72600666547.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/90833851432.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe9744966b---lukumiwenesadenuriku.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fccc8f19d---davutebedabaza.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/debaradobume.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/wivogirozogovufalamubad.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/70175115529.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210521192417_gcny6f.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4322b4aee970007460baae2e6acd1fd3/dapaxitejexefunolakav.pdfIn PDF document text
    • https://baptistfriends.org/media/99540976446.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/61659790989.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612170c01b864---fufanozi.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161068ca508c73---8883778941.pdfIn PDF document text
    • http://haki.vn/uploads/files/vuvozadugova.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e15af1638---tedixukoroliwipilaxopepuk.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5d58eae3311238d6758a3b1b483bc6bd/lorupudizenisodofimujid.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/puxegusipazupegexonopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=roman+number+in+70PDF 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_off0000b6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AF 14360 bytes
SHA-256: 9e06351a45d3bf6d91f5d9d3634ddb07117712d69263e695b2f5a6fa8951a7cb
font_01_sfnt_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 10416 bytes
SHA-256: 233fdfad8326dba00b902670e2a1858b5ad935a84acff4a9de39eff2578c90dc
font_02_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1