Malicious PDF — malware analysis report

Static analysis result for SHA-256 275615b32766ead4…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 01:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 331903a943a8299af7219a03a6030f6c SHA-1: dd0fc0fdc105d4995ab037b02208d5c6528fb95e SHA-256: 275615b32766ead41bf41b644a9ecc0f32457bb6915dff4aaa04eacf9b2bd3d8
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various websites, some of which are hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious or phishing content. The presence of numerous unknown URLs indicates a broad distribution or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bqv97u52beog90nomm83j1fqqo/84217160258.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609450db798f4---ruxixivuxafijubawisuxi.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/18030304299.pdfIn PDF document text
    • http://amdind.com/userfiles/file/vosavor.pdfIn PDF document text
    • https://yasacompany.com/upload/files/24630903326.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/nuretijekogelemo.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/fiminunali.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e23b32f6f---33910039837.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/fifupemefawibupe.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///dunekef.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/48f82868f1bf7eba251ab16b9bdfa2f2/linulalaxazesojoviju.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/lixaduvomuxilomexomamig.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0dec5a2ca---51120072570.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210722161240121.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/55707442586.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/3339695ec575afeda94457e650761394/84847996670.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/bivimalorapapugubojanig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=novel+berbahasa+inggris+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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 10864 bytes
SHA-256: a3ed1775fd5f4019c87846206e3853f4f171146071349b9ed6081207e5593396
font_01_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D9 18536 bytes
SHA-256: 3fb354ef588d22edd06bd572b9f022ec2723473b1732793fe0b7d23deaf1690f