Malicious PDF — malware analysis report

Static analysis result for SHA-256 276e2c8c1bf73b04…

MALICIOUS

PDF

70.6 KB Created: 2021-09-03 05:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b33ec24b8d6968708d19600db1ee58ca SHA-1: 5b62b4766b2ec88d2ea281d04125dd2b47eec4af SHA-256: 276e2c8c1bf73b0429f1994d49d90522433614795c38e3c90a39c328f84ee605
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=sermons+on+grace+pdf PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ghmgd6qvptgalj6bqeso40heqg/paziwifugu.pdfIn PDF document text
    • https://ckmandarin.com/uploads/24839548444.pdfIn PDF document text
    • http://derma-dts.de/files/file/91997667875.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/tujeka.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/th65eg0dq8sbv5olt10me91tq5/vikegukilodufada.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/rufolapagidefopututanosa.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f14a9889b---fipukepedavupakexovizuw.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/44769942308.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/16753652873.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003853aea3e---61177829670.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/lababasugifoniremajiv.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/55js7k8p5phonbpevpkijkpch3/67697912887.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e82b95742f---keboxigefebekenunetirova.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xinesobutifemaf.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/pabedujakakolirudevu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dfca1d618a---1834442403.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/17900356824.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/43696285528.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff5de99a50---vanemizojuwef.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54fnnljfmuds8v2511e5a8f0p1/2099029505.pdfIn PDF document text
    • https://strechybenesov.cz/content/3955839797.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/38672902568.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/mutukonosisamowebedipon.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eec4452a3c---9599141264.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BD 10800 bytes
SHA-256: 73b8214ade9213b0fff2332cf17aaec36273b8d7b200eaeea6b55dc735ebf2ed
font_01_sfnt_off0000cf62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 15068 bytes
SHA-256: 662e92bbe8102645c7ef90d3c6a1ed05cb707c3080c48be4b972654ff093e78b

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