Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc226a93e3642b78…

MALICIOUS

PDF

95.2 KB Created: 2021-09-09 23:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 537db70bdb6765eaa5977abf052185f6 SHA-1: 26a843392de37451f67f5892a04cf80ff55b66ab SHA-256: cc226a93e3642b78a3c3f49cb851678400a3c8915ccac104faac987f5fcdb77f
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 phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://gilbertems.com/videos/file/segewixugigavetenebozi.pdf In PDF document text
    • http://acecaalcoy.com/userfiles/file/nerixajufegejuzufomet.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9q78qpgc96ikrknulf43qvufa7/83543841578.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/lokaseminerisur.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613244602fe04---nazojomot.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/15084952121.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/80943045233.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/aba0acc0132104fbfa01145d6a400bcd/54368778252.pdfIn PDF document text
    • https://hoalavender.net/upload/files/vazabiribifilonororog.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/nijogu.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/gapezadozevox.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/62798667270.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/83388250483.pdfIn PDF document text
    • https://masihpt2.com/contents/files/fuzegozafutimonebikumak.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/pugabafexewipijo.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/jasejegelagazotedato.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/xazimorakopibokib.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/37705806379.pdfIn PDF document text
    • http://chinazzjx.com/d/files/27114407415.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/pofumumuxibo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130433660903---62564760331.pdfIn PDF document text
    • https://dhesient.com/media/kabadozidixeg.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/nozenigikujoxezitegozebu.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16311093203406.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/67333456471.pdfIn PDF document text
    • http://wdnederland.nl/file/lefafadibidakiturononaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+sites+to+get+free+instagram+followersPDF 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_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 18500 bytes
SHA-256: 2b7c878123f6d3ccf62a6d58164c8f13cd178b993e661d3d123d19bfe0f7d01f
font_01_sfnt_off00013eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAA 10696 bytes
SHA-256: dd16da782fba00723971d75ddec7d5f6b7cca7498e5793887cec42a7b50f67f3
font_02_sfnt_off0001574c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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