Malicious PDF — malware analysis report

Static analysis result for SHA-256 d421809bfcda07f3…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 01:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35a59edd9670107dabcf17c21e1086d5 SHA-1: 2a447495183dbfafb6da9f4febf65e9492436bce SHA-256: d421809bfcda07f39f14f80ef49abd96d6a3a9bf9e98b542bfca219c4f7b5025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure and URL patterns are consistent with a malicious document designed to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ks4c1jg4lqn0e8br2ks5ineb5/wevimudat.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c9db14744cca33c62f2eb8c8b0ab9be7/bujipil.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082da31c8559---27829499597.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fb53368e2eb0fd2e3ef7549014d3695f/50597446587.pdf
    • https://curewelldiabetes.com/userfiles/file/jegomuxetopirodiviwa.pdf
    • https://wfca-czech.cz/temp/userfiles/files/xutas.pdf
    • http://hilimall.ae/uploads/files/dukiperuxufumolotix.pdf
    • http://formel1vermietung.de/userfiles/file/kifawekinirap.pdf
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/85135448262.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/5c040302ecb94bbc73d471cc4e13ed63/xoserosuxibo.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/dfcvlgb7osds70c66dk4jmimvl/93383054764.pdf
    • https://giolog.biz/images/bulk_images/files/73237262479.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd5d4786ec---kekowemonip.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/sdsbla57fb40fdbbhbm6l95if0/89299866913.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3a8c5afb---98656959160.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/aa9adb7af9aa7d04bbcbef8f15ee9dbf/fawogafewenon.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bfd30bd5c---lofasiropili.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c71d84ac27d09c3558b60ec6d2721a7d/pokefogo.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a758b5eddeb---36784384926.pdf
    • http://absolutelyneon.com/userfiles/file/lakufisafivesusojim.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79365c6be4---ditikek.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e4ed2877---42382953627.pdf
    • http://www.aportecnica.com/imagenes/editor/file/63568045597.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0pg0u691098fopp6gg0l5qfmcb/mibago.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=happy+birthday+banner+letters+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84d.bin
4b278dee4b0d6f42df89f2a763d7ece96a21a55900cc9a17cea9413c2c59173a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 10720 bytes
font_01_sfnt_off00011092.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 16792 bytes
font_02_sfnt_off000128a4.bin
0d625ef506f4ed97dc0d2d20daa433a7b8f2524138f63c7369dbec64832d0715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 17024 bytes

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