Malicious PDF — malware analysis report

Static analysis result for SHA-256 603fc8618089bbbb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 04:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 087f3b895a523a815aad6fc900fa6c45 SHA-1: bad1fb1d211c5fcdb57d1ed21bf896b80b18aee3 SHA-256: 603fc8618089bbbb2b28febb8f769f8b3c1bedc9444d8cd2e646a7b166928995
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of multiple links on compromised CMS uploads suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://smartmedia.ro/app/webroot/files/userfiles/files/mopetitodifekasesebivuwe.pdf In PDF document text
    • http://finproekt-msk.ru/userfiles/file/jesotatataluragozikol.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf3a7584f2---13482958111.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/46397821212.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a6bd3bb636---56624366446.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a239e8e9---diwebatidifoguguwatuwo.pdfIn PDF document text
    • http://rykatd.com/files/14567756500.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdafc1cf86b---roxezomanejovujavitokures.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b27e274fd3beb913fd4ab02564a566a7/72550529932.pdfIn PDF document text
    • http://bronia.org/userfiles/file/refezipovewezepurekal.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610877a07f51b---danaborarilewowinazijapol.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/giselofezitavavakasu.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/341317289.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/99849124737.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f449db2c503---35947685445.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/jokizugigodozupe.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7b5dba4fdb06b6b9c6a9be7d36118cb6/88460687281.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/gigawigeduxe.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/somenutumibuwevupotufidu.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/63598320730.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/90795564354.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084137c76f76---kofaforizuxelixo.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/besef.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/c23672a13fc5d40fe4f71710f525e44b/22066079823.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m34lg74kosl23fotuj25g4of95/43141738109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=english+for+international+tourism+pre+intermediate+pdf+free+downloadPDF 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_off0000c498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC498 11116 bytes
SHA-256: 6eb1c3b9e3165f01fe9262e8c421f39d9a47ce4950127da72e22ad760c1bd392
font_01_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 17920 bytes
SHA-256: a219c3fc6b38a524f283a5972a9670b1ccab1997986aa36e36042f53b9bc2ead