Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5aa34ff7b530c0…

MALICIOUS

PDF

84.4 KB Created: 2021-08-18 18:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c86299cc2af89dce0b1443e0c4deb6e SHA-1: 1f0bb7fd57bd922d4b3c5cdce09605539b178dd8 SHA-256: 3f5aa34ff7b530c034e5bffe29e4ca12a8a3fd6d00dfe87adbeedf3795b38418
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 CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://archism.ru/uplcv?utm_term=wondershare+filmora+7.8.9+clef+de+search PDF link annotation
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/gafabarofidekefe.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/xiwuzujujexan.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/wabik.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/64430814558.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/sumokegemogedaravosez.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/kexudabitidolapegelelere.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/35125267950.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4279c6dec5---88248095181.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/devapujotidudevito.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/lobarabunisid.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a26384ee---faxopokejuwawabezafidoren.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kujekowavixare.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7u2r9jl6nnelipl6c5bpehv4j6/869996484.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/36684955287.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nebijur.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/91483771540.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/sofufelefogizejanij.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/b18affa714fd196442bb941141f81921/68360643651.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2e4990884e25221dcc0f9bf17c88e8f9/97364798677.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/digava.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/varofefesoge.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/25157214113.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/molafepejazafo.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/garimulerazizabobomi.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00010e9c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10E9C 17900 bytes
SHA-256: e6d8ded976bf4707a3a4e7d7839ed79847a8a687424b5142dd5b8c4eec3d0737
font_00_sfnt_off0000c94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 11128 bytes
SHA-256: bf44ac045f721ef7802da5489b89a3774505e8e69d5be3cac9281d182bd5ae75
font_01_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 16672 bytes
SHA-256: accf2326ec9d25124e2bfcb8757d2271b3775dc284c566afe01f83de5c0c59e7
font_03_sfnt_off00012a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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