Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebe0bcda811b422…

MALICIOUS

PDF

77.5 KB Created: 2021-06-10 06:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c98163bdd70d04fa564e54aa7fa135b4 SHA-1: 58771854835c951cbcef678a47f5ab90b9f77fb9 SHA-256: 0ebe0bcda811b42286aeaeb1b589c41d148ce32493ee776b2a60901bd4d8a2a1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm, with URLs such as 'https://huntic.ru/uplcv?utm_term=the+millionaire+next+door+book+pdf+free+download', designed to obscure the true destination and potentially lead users to download further malicious content. The presence of multiple links to compromised WordPress upload directories and disposable hosting further supports a phishing or malware distribution scheme.

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://huntic.ru/uplcv?utm_term=the+millionaire+next+door+book+pdf+free+download PDF link annotation
    • http://a-kamen.com/userfiles/file/59815212705.pdfIn PDF document text
    • https://bloomeng.com/uploads/lasomejumeburapaxawur.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/fhaga1usavb8725vkj337k9q6b/mufurujafafukukezababa.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d223942c18---dulerutomesavotap.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0e121c3d36d70b22e75bb6a2b6a32b29/buzaw.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/24de06db74c55874690eff2f4f535a18/15686814958.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607491e1152d6---95267332392.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/i89mc9pssotfbcb1kc8ta22eru/tawimidetimuzoxagota.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/letanagitekubabiwa.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/zidevupufivaratitoj.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4e6039e0---95871797019.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/6ab7e1559709faab30043e33212844f0/63414152576.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/0et8irtm2qjcl88ma8tqvvhgmk/90354686185.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vogason.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/memaxexu.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_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 5416 bytes
SHA-256: 6f77297c89034f3cacd6c11756f1819d6f642f024205fec39c2ed6600fdd7021
font_01_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 11432 bytes
SHA-256: b4be299a85dcd8c21eb8c15008abf0f253b0a31ff92728e755e6e74d6561223e