Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92f2b7fb932939b…

MALICIOUS

PDF

79.3 KB Created: 2021-06-17 12:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e83586bf53fa79a029266d7f867ea367 SHA-1: 8f5f1f6d64709daac11877519a22bdf1260f06d2 SHA-256: a92f2b7fb932939b5d92bc024c0629ed722ed932d336ca77a87e8c3379299613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'green screen videos free download' and authoring application details, likely serving as a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f7c38fd08bafb4e00f4a9685ccd4f2f5/70762696797.pdf In PDF document text
    • http://ersatzmonitor.de/userfiles/file/46632008702.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pefodiz.pdfIn PDF document text
    • http://ahchala.com/img/file/74407589639.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/526dff370485714309a9fe0ebba2b16f/55729106619.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/86949005802.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/18795308156.pdfIn PDF document text
    • https://afayl.com/userfiles/file/91402953404.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc21c41e0---5146481902.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4af736f24---23411376522.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/56478d9e80e391279e26e9dd4cc3cae9/rilorokefujesobavapav.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210601021537.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dea524b084---31549461807.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/raxuzixemawosidizibak.pdfIn PDF document text
    • http://atomleasing.ru/media/File/10664007418.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1f1oao6v7a6of3rd08mv3qrui/fisumunogadufogumom.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed8513014---62102189627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=green+screen+videos+free+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 5196 bytes
SHA-256: c9d9be0fe9422de9018fddc110b6d244f9f5cf7c622946cbc4e298dff14c448b
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 10800 bytes
SHA-256: 526b09d6d9b7c7a0b19cd2d68d129f8e13208c00a148c64480dff2abe615a557