Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf30998faea165b…

MALICIOUS

PDF

73.3 KB Created: 2021-08-10 07:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0f913b6309accc159b9cdde159d648df SHA-1: bc78e670c853600ffb391daad5ba3d1623c8d1e4 SHA-256: 5cf30998faea165bc4c970df098bbcc8d6d4b17a36969c31543432231d917ccd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • 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://blogsma.com/files/wulujonapax.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ceec5f0e31c97f168f09d8f637a1f4c3/tuwugoluvomoludepitupek.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/oa5u9h2fcdirdc66r5kon5da56/muwuzalumefof.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/miditemenusawivokeg.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47862754956.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/35795809007.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/vawipajuzowojokusi.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/losenipetorilufil.pdfIn PDF document text
    • http://fitviewer.info/files/file/kakabukob.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6acf63d94b---16004057732.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/13426189993.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a8ee7e18---88147352560.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/98849404980.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/75129871843.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/karuxipivivurogepepatebe.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cff11d553---gipilajojajuvujofoz.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160799585b39fd---16615539689.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d58cd043---32440877923.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2bdvgoc3s7sm4qtfh76o95a5d1/polok.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/344495fa148ca0b20de196c89009b20b/bamanerafufatelif.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a24082201---jofovar.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1625541642.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/xeramasoberusofafob.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/63988190602.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/fubatejudalazokejazimil.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/sapikujarop.pdfIn PDF document text
    • http://orderkai.com/uploads/files/dujolagen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=permutations+and+combinations+pdf+worksheetPDF 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_off0000bcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF4 11256 bytes
SHA-256: 4293a6e83e1185db3452b8908f7a9f4a4bdbaacaa32fbc3394c88c1b21f96354
font_01_sfnt_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 15824 bytes
SHA-256: 106b71b8edb91e994afeccd42a9d2e8febb0e415b0a33d4160cabc56e8b17744

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