Malicious PDF — malware analysis report

Static analysis result for SHA-256 558df6d8f589dea7…

MALICIOUS

PDF

90.9 KB Created: 2021-07-07 03:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a9c87a3b5b724fbf9f4c77ad754e7761 SHA-1: 942237009ad735c66b7ef4bf6bc26be7c631f318 SHA-256: 558df6d8f589dea78d58a6f2d0bdce683adaa1054b24039265e1768bfdf6f0b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dioceseofniranam.org/userfiles/file/fatotiwutupufev.pdf In PDF document text
    • http://bawaconstructions.com/editorData/file/tudijuwusole.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/tuluzutujimesaguvoti.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/firerifapelivafoxe.pdfIn PDF document text
    • http://aven.su/userfiles/file/95140337686.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/24870385290.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab529a6e5ca---pabatir.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e7b19a7309ba76e311c586b57e9bc0f7/1114720508.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a4c094f68---jovez.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/5c16f3cf807a5605039e240bfc0e9dfc/venabanexuk.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621154967.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5d901eedb09f5a108a32492a3fe9d18a/30358737950.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f7efb3be4d32f147bf2f3160325bd873/nufobavumelobop.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jfstr6835sg6iqkgkqh8nqab7b/jirinipimibunuv.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/32395070718.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/hhv6inlnf469jr5qkc9jf7otm9/lifufimovepunabub.pdfIn PDF document text
    • http://gabortech.com/admin/file/lalixa.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/tizogekiwaruwexitawowim.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/16c0lo09ot7us0tncl7qo6v363/magarada.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/80973138940.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64489b3a02---43087608646.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/11g9oik975il21ndn53qtmqnqi/18706579538.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b80c961ac---36470655499.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a81825b003d19d39e99a1f3e55fb1229/68050594757.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/polebukezurokozumadob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+way+to+sublet+an+apartmentPDF 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_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 17076 bytes
SHA-256: 3c0b910c72551590810145f6004e93e88fcb2dae13cffa138d95fecf35e8695b
font_02_sfnt_off00014382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14382 10812 bytes
SHA-256: e49317786999317d606464c34825653255cadec58ff45f32e188a9cd25c53603