Malicious PDF — malware analysis report

Static analysis result for SHA-256 631fc6b2ecccba90…

MALICIOUS

PDF

81.2 KB Created: 2021-06-26 00:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6391e3f0c00f50e55d8587f6b817159b SHA-1: b0a3026b1bfa955e6dc545e3392036ae6fb89e14 SHA-256: 631fc6b2ecccba9057988dacfc10b159209fcc16a21a329d06095eafde9cd8b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely to facilitate the download of further malicious content. The presence of embedded URLs and the structure of the PDF suggest an attempt to trick users into visiting these sites, potentially for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://ketchas.ru/uplcv?utm_term=drake+fire+and+desire+download+mp3
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b245de40ba9---nekisulaki.pdf
    • https://newtop-eg.com/userfiles/file/25223550201.pdf
    • https://mecaniquekd.ca/upload/file/fovenibokedokakadidamane.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2d844092---98280007305.pdf
    • http://allmedicus.com/userfiles/file/namamo.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a9dc810e---kiwotawanedapasafejoxijuw.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086af8a09419---jixawegigibukukanan.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f0f458248853dcf64a41b99e0b48f43b/18674607578.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7cfa328bf3c03be9a0c6f23187355e72/junupusomezamagirumo.pdf
    • http://on-video.com/movies/movie_data/file/pemaviwixutujenuxizagus.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3af75d8ce---kajetutilizogatibavetik.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/1iuikm071nr1dcmbvkgiieu162/wizefagopamotike.pdf
    • http://ibtaker.ps/userfiles/file/15695381003.pdf
    • http://cokhiminhhien.com/media/ftp/file/pizodaxezogoji.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096f2995e56d---nuposu.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b7ee8ad36---33853534214.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/96576830907.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a7ad9b867a25bb8749e49bf3a4d545bf/xixowexa.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609129d6a50be---pemimoxa.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3367a00ea977afe6e1a0b1fef82698bf/55700984103.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ae9e5ee3a2f6b034ae9bd79cfc009b5c/solujemugapijawonabivuwip.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7de0d06c3---74143744597.pdf
    • https://badrivishal.com/media/kirokejidelekilarejeke.pdf
    • https://tonwen.org/userfiles/file/folokulefemukixan.pdf
    • https://habrit.tw/ckfinder/userfiles/files/saguxulipe.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a4e9493633a14a8b1e6491810c5d7231/wujiregazaj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c365.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC365 16792 bytes
font_01_sfnt_off0000db76.bin
7e09a3551a5f95464d485b0302bb2ea5a0fc1ccd586ad0b46555f182e6907fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 16060 bytes
font_02_sfnt_off0000f08c.bin
175b0919bd0519c289875553348900a3b18b66ff4d8f14e159c3236c47ba6094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 10912 bytes
font_03_sfnt_off000109cf.bin
a657be71acbdb2915466d10519f908fdc0e0f2f050bef0bbec72f36f09f2fcee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 17144 bytes

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