Malicious PDF — malware analysis report

Static analysis result for SHA-256 875991b72ff6d490…

MALICIOUS

PDF

94.0 KB Created: 2021-08-17 20:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ceb0dccac13e6b6da82a8d5e59319859 SHA-1: 43fe6b8258fb740bd5cb5b30e53a61a6aca543c7 SHA-256: 875991b72ff6d490f57d0dc0c3fc4d3fd49ef8bf2c578759c9e85eb0e69c0478
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/37015657818.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlr399kko24g90eolh0cs01jts/refarerizanogafirirejemo.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/12122988274.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8b26b908ccbd22bc3e11c315512e8c81/linupup.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca981c8b3---lazigeziwemazewu.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/45f7a6ff2792ed4af66c52062e36e280/degadom.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bsfg6dh8rnb08igk7q98h1cfh/sojururizoso.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/edae504d641d2b03b5e89f9096308749/gisox.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-23/20210523065807639152.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608460eb2cf6f---50765447314.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/49779977573.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23587a1d0a---voxelefufapigamozuda.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/56944887526.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfce43d75a---47894600537.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/71611503241.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f6aa7746afd7190addfdc7a71546a7d9/piziforamomurakoge.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c53967c4bf0---podato.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/28374078928.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/noraxepoxo.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/mowegobogus.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8v6s9vu91cpk7qmm7khdmrf2mr/fedimazejodolefijexa.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f9o8i2g2lsg98vid39dnko1k11/gosemuxoselatujiwigelijid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=la+ley+y+el+orden+uve+temporada+18+capitulos+completos+en+espa%C3%B1olPDF 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_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 18360 bytes
SHA-256: 35291d8102d06064eb969f1d9accebec40538818e589520354d82f53cd28d632
font_02_sfnt_off00014c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1E 11380 bytes
SHA-256: d6e233be49e37a173867b4c48075d7bddf7342539febb8ad497f3e87297aa2f6