Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67d1d03f188f372…

MALICIOUS

PDF

79.0 KB Created: 2021-08-29 03:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f99285be684ed12c576dcb31749532c SHA-1: 058c9f4a0d5d7ba6bb716b9a26026deeedb784bc SHA-256: f67d1d03f188f37224f84dab54c42139b93ce3023e6055d9a0a571d60cde5914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://jnnycc.org/userfiles/file/niromuxaxugijigobegu.pdf In PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/65984106440.pdfIn PDF document text
    • https://armenia4d.com/contents//files/fenivo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117b8f5c3f7b---42159766209.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160884049eaa24---3081629385.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/bbf7caeabe2a887200b8c2c17472916b/jejudinawomexaxi.pdfIn PDF document text
    • https://mimpidia.com/contents//files/mevujoti.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160998812ca097---saduwexif.pdfIn PDF document text
    • http://didula.com/img/file/90696114866.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210614_4969078E04B9F41A.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ec940faa086ff9480b39bb9c5692dbd2/40030405774.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/31471410450.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1b37cbdcf3a5b6fbf32ae3b950aebe49/sadoxafezupower.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/mijifibatizoxiko.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d3d63e44---2306630491.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/8298835575.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/kemujezozu.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/lezanadinuseripinutiketor.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/13212331281.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a527a812f---fadefepekipewuvigu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ahj44ghe5jpd6a9lritvh85v16/tojagadumob.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85231477981.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789a441d537---56622299224.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/fc665c174b7d286011b5af8db8d983f4/sobusoja.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/jubufejorasor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pawn+shops+from+my+locationPDF 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_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 10816 bytes
SHA-256: cb5418100cc9815b07209591987dc220913cb445e6dbf9b5dbe6824f03b73e97
font_01_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 16024 bytes
SHA-256: a3d778c40d0cf09b43be1c4d1d52eadd58c2f707ac1da1dbcf6ae6d3e3ed8a9c