Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d088e85b384be0…

MALICIOUS

PDF

85.2 KB Created: 2021-07-15 12:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee95ccf154119ccb3c4f8771d99e95fa SHA-1: c93e241dbabbc3f7e0af8bd2c58255469cc0f22e SHA-256: 84d088e85b384be0a717b90d3b97a2726607e3a179b3f24e44f035f5c0ee3798
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or malware distribution lure. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chipmax.in/chipmax/ckfinder/userfiles/files/xakuf.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4aaee00b---ruzevejebupuwujidulebogo.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/mipafilidibu.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f6061535b86b994701b9b1e4df2cc3b1/gidozoxozunulinopubux.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd492927c---xidibamesumumevogotukim.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1c8293c210127f9b21193c0a0c938fa2/27579862958.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609858078fb8f---ligejabegajufupo.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c051286cde3---ruxoxutoro.pdf
    • http://brenna-ski.pl/userfiles/file/pafozuruwoxiwozor.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/91422724116.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6597020a76---94940113984.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/mc9d1vtjg0d3app864efjtvqa5/78368815055.pdf
    • http://archi1919.com/smlclub-files/file/moxinuxoselapesisa.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd9acacc1---lumitoduluzamiloga.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac138fc0e---buwazeja.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a8997f8670775701be5cb2bae43ec1ea/nezobif.pdf
    • https://magnettoptan.com/upload/ckfinder/files/gedimaxuvonaw.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608914e7e8578---59724943485.pdf
    • http://hataylezzeti.com/resimler/files/jujunu.pdf
    • http://asbu.net/uploads/FCK_files/file/60538978789.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/7fe9o94vf5ccqugfg3fprdmd7e/35074937677.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/32656727036.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/mumilonasex.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5ua7dav2qsv04g9kag24fbkmf/24308803777.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+does+it+mean+when+you+yawn+in+your+sleep
    • 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_off0000ea40.bin
0efa28f4a24a292f19385f69d70481e540e377314d7bbf42b450fdba7ba1f4ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 10948 bytes
font_01_sfnt_off0001037d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 16792 bytes
font_02_sfnt_off00011b8f.bin
4c843936fea8a100ec03a94ba63c4fc924a3b297f06bc4ca03b00fc909342bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 16736 bytes

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