Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b8c0fded8858cd…

MALICIOUS

PDF

99.5 KB Created: 2021-06-13 11:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b836595372b106c7c629e1b0246979df SHA-1: f3e008e074a3ca7b085e7ee4ab903cfc605f9eff SHA-256: b1b8c0fded8858cd66e9da9146bdacf98948f4e542436a893ad3c4893f2b01e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to various compromised WordPress sites and other domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://laborke.ru/uplcv?utm_term=ela+elite+rainbow+six+siege PDF link annotation
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/vkh9pmhbv01spmfludftecoug3/4721199475.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701b9d31a88---dowoxapavikub.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/653e9f43eb4b03659f4fb96b041591b6/91994229936.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e7015809c0db9370d247687b9ad69bdb/paloxexa.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/tisumajazupizibi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/6477465747.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/kebesu.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/47015371968.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/rowusudarubediveseto.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vp51a42irf8b8vsuujvr24d3j6/dekurunilobite.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f8e0fcd95fa679d8c9f626423c62fda6/puvexitat.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f6645a760---45697976890.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b4af8cf9ce200fdfc11e2dbf30edb247/58821482656.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/vv1i9q55fjdc6u126nv76a94s3/tapibis.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160744280da0da---rufowojifebemumanapafose.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_off0001467b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467B 5112 bytes
SHA-256: 8e5e2c5b5bd4125bc643fbe57a4dccc00824fa67105d92a4d0e4c2b1c65fcea2
font_01_sfnt_off00015806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15806 13508 bytes
SHA-256: 794313b845abd370bb18719c3421ce95827f5c2df7e37cafc4126a1dfc5dfb52

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