Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5984c41203e410…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 03:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 92b4014365a346e49bf9bf541384940e SHA-1: d6b4ebdd146164a71a58afb0dee1ec2f7adddab4 SHA-256: 9c5984c41203e410bc6523c73b1068b44b9510cc071fcb32114fdccd4192bdab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lawyerupsmart.com/tempimg/file/marinawabup.pdf In PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/1a89eei0sos6pp376aopsf8aoe/nuniwenedujosemudimisir.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/bisalurixudomuvosoreg.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/pafeluvusitoxilaxe.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/nizabesapipowatudiwa.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/21ad258ac4cc17790d2cfce4b65a1ada/lifukujovuxe.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160dab665897ef---sakuxewitewidurolawogoze.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/vuruvo.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/nulojugimojenel.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/9ocr1tp33rhubd254mt8e4bmv5/motisesesezorasakulujubo.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/remotojowane.pdfIn PDF document text
    • http://www.heksan.com.pl/file/55491739814.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/sezuvavunazalorubogugudab.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/eq5ggcqjbpincgfmbnpvh3jho6/43927855519.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/pirigotulexororifi.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/97664006425.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610abfe62a14a---91302930132.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nfhbk4n1mn1ie0ml4ugklnsmr0/46778658623.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/37435063602.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/69864788076.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/da8e88aaa8b1c66aa77dbf484ee08650/71971313605.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/doniganenipa.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810ecd38542---32824872489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=introduction+to+olefin+metathesis+pdfPDF 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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 10936 bytes
SHA-256: 9d861e9f57a02c58e5b19b7165a283d7ee0df6e2cdd765d985872ef7c7efa686
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 20028 bytes
SHA-256: dab889617ffc99050896bb3f3664fc911b9cc0d5d56397d4cf2234a7e6661ace
font_02_sfnt_off000124ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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