Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e6e605d5a13872…

MALICIOUS

PDF

75.3 KB Created: 2021-06-24 09:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5a4a23113daefa872cf06c41ff107df5 SHA-1: 4e76bc1ad35fe398b9ec9b0b0989853eccb41e1f SHA-256: 84e6e605d5a138724fafc6ef6a9d557576d6b50d254ab1a4465c9044e846a52f
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://chcial.ru/uplcv?utm_term=secret+life+of+bees+book+online+pdf PDF link annotation
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/bf14f87604d3aeb3bc06beede3ded55f/bejusalotodap.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a2fc043f8---9766444726.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/275dc11f054a63809739becc6a2158cb/nigokizalatigi.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nekirun.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/5b283d2f2004a6d140d0d27355780695/favamunuvukuwe.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/84042286092.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/71997381052.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090696749148---25273163200.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/fowupuvofu.pdfIn PDF document text
    • https://cncunse.com/d/files/goxegubupovonakik.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789e7594760---sojikigitanetilinijibi.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/datemoxapufotizapuwoj.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afde50ca82---14782727098.pdfIn PDF document text
    • http://bulmarconsult.com/files/zusofazudodomanapef.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 5244 bytes
SHA-256: f4a17366073fea78d37e8af2e69c5026b17a01a42a49644052a7954a4f7cd566
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 11176 bytes
SHA-256: e8faacb2b63151f31d5aeb49d3289472db3893a93a1883850f2ea02451c67688

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