Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed76cae47bb9ebc…

MALICIOUS

PDF

88.0 KB Created: 2021-08-15 17:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aefb7a22d62d8d29138d1d00c498991e SHA-1: 51250fe7894bf5e8687300dd3e658ddc0c5125ad SHA-256: 8ed76cae47bb9ebcc96f8f5193e5052a145b5a00d3d64b2c4f44e26a6f9e1391
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other unknown URLs. These links likely serve as a lure to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dec211281---74960529242.pdf In PDF document text
    • http://i-physiology.ru/upload/zanodurigesafipa.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16081127919195---raluvuva.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b4c985fec---27527014124.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/28928118941.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/fovidaw.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/40288771307.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246d7c367f---58055391689.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4avec9vso8g6d5i6h454dkak30/mugosisuvupiburaperibaja.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/798613370c1cae35b425978825e71278/25965391426.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/66644028278.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/42660172008.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8fe71a9a46---7337607210.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/38416607610.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a503bdd1df91a0858f36d5d8f4d635b4/gosizonaribezubopojad.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3743cd697724fff6eb945402cbed3ead/32761766518.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c5d71588428c39a4a029a829bf943220/4629081105.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad74bb55d9---96944676823.pdfIn PDF document text
    • http://lblussana.it/images/file/74958414793.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/febiwopa.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/xarupawom.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/xejaxupil.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/lixupuwamosipitozuwadipat.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/80674831232.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ba860dfd9---85229246066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+empty+dyson+motorheadPDF 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_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 16908 bytes
SHA-256: c4e655c64a486f2ebf61f58cc1b17549c18e08eb4effc53d101702ccb0cdea97
font_01_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 10712 bytes
SHA-256: af31f9dbfe79e7196e63a6113248d1bc5d372f672fa158aefd67e10a9100b595
font_02_sfnt_off00013941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1