Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db3e48e87a543ae…

MALICIOUS

PDF

85.1 KB Created: 2021-06-24 13:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bbe7024ee0ad4199d213e392f55eda52 SHA-1: a47d644119561d5ca12f4a028c5a3ae48b3591c6 SHA-256: 1db3e48e87a543aed8cf11c908a43892f7bbeda7702d0a79c263d00179f1ba35
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The document's content is presented as interview questions, a common lure for phishing or malware delivery. The ML classifier strongly indicates malicious intent, and the presence of multiple external links suggests an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://medvor.ru/uplcv?utm_term=interview+questions+and+answers+for+operations+manager PDF link annotation
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7dc86fbce94b362aba57f8a7b8983b85/tovaxugonewivixexo.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/94f9ea3b7a5efdad08afbb798fc33beb/62022651804.pdfIn PDF document text
    • http://gute-reise.ru/i/files/files/20601543756.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210612_112922.pdfIn PDF document text
    • http://canvangdientu.com/images/file/gatelezafowowogite.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/81769901006.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0d8c3a8cc2b39a8910543c89324a0883/31267658657.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d7f5fa785092b9d9b4a7d1325dcb16b1/86976274211.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/79358380702.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ehrvob5jkm83cfdomklm6f9b70/22828888343.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7c896a20---43555166383.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a10b2bf66---51484486894.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/80489271350.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac941907648---rivadupozolelojozex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 5544 bytes
SHA-256: 932c092d221206d93d2abbcbf9b04b55f9e940168d29b3a4bc230b6fb6cd87cd
font_01_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 11740 bytes
SHA-256: f19df3d6a7bb64b7725d4b06c474cbf22ee89ba75ca1235c28da472fcc9de79f

Open this report in the interactive analyzer, or submit your own file for analysis.