Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb8878d7be03f95…

MALICIOUS

PDF

68.4 KB Created: 2021-09-14 14:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9bb8a6f34d10d69680b17f26c830d95 SHA-1: 5f583015ee4ca239b686cceee375a15280146586 SHA-256: 5cb8878d7be03f9535c33fc13540d8247672060945539d123e9a076f74492b3f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL analysis is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://allier.proximeo.com/ckfinder/userfiles/files/jegog.pdf
    • http://birdwatching.sk/media/file/55821321485.pdf
    • https://superchills.com/userfiles/file/73081680641.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/72aa790c4c0f9c220bc8ba65ad5a7fd9/16982110761.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/werexidexaranip.pdf
    • http://mega.kz/media/upload/files/86109697928.pdf
    • http://truhlarstvisollner.cz/data/file/punuja.pdf
    • http://lyzebrno.cz/userfiles/file/48760189643.pdf
    • https://noihoithanhtuan.com/media/ftp/file/nevitagoz.pdf
    • http://rwdwebwebdesign.com/img-aim/files/saxuposonibubosemadik.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/99e73fda59033d496a3b6d4028b70a68/97014253761.pdf
    • http://grupposcorcia.it/userfiles/files/wataz.pdf
    • http://arucax.am/user_images/file/judogegenijed.pdf
    • http://vit-physio.de/file/86660177357.pdf
    • http://galluccifaibano.com/userfiles/file/nevuxukufetesalox.pdf
    • http://sunway.me/uploads/file/140341243308.pdf
    • http://tjsyjdq.com/v15/Upload/file/202191498495319.pdf
    • https://renesens21.com/ressources/upload/files/72257743665.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/notubevixaserizivode.pdf
    • https://traffictkt.com/viking1/uploads/files/56166231693.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/aa4e406561fd13cd22d8ddc457bc3283/fatimabapo.pdf
    • https://alirezamirmohammadi.com/images/upload/files/55801628563.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+download+pixelmon+on+android
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b01b.bin
15caa43535a30b1e261560f2758e8b2d716849019296fa0f09ed002eea11fef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 10564 bytes
font_01_sfnt_off0000c827.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 16792 bytes
font_02_sfnt_off0000e039.bin
99ad6b5924033b2a3e7d7a2c94f61ac76bbaaaaf5a503ed4b95384d65870c09e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 14500 bytes

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