Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8985d5154e4436…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 04:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf59e5781fb9d67259f12691784ae59b SHA-1: 1024267c394a706618fac383eb5a7b46c7810b89 SHA-256: 7c8985d5154e4436a7317303c59f51700d8d992cdb63df31505ff716d4ea1cbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=antas+ng+pang+uri+worksheets+pdf PDF link annotation
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dea5hsaa97o6tn9f22m14v3hi6/81763329428.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/tujimikudo.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/23148315458.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210831014806.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/gedajefirubidefuxofon.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace89369143---95974134792.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d96c708d8---xizuxo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd4ce7e60---bomiwewolatoduzigo.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/vafujis.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/sobilivazarojikinamiloj.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/zivutivomemofemun.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/46806236723.pdfIn PDF document text
    • http://lawngo.net/fckfiles/9587240315.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/bomaxakesapukixerar.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/vejubigipemuxasekomizo.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/7caf7dac4584c83561e1af181513ea70/96659775382.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c2253755b---239090002.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091049cd681d---risetukagugiki.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/likumuriri.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/86088670576.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/14703943499.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e03b25fcb4bff7b42cb4a93edd54a809/91579370663.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/65106740601.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b3802994---ribafuzemurapub.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_off0000c055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC055 17192 bytes
SHA-256: b8a1cdc5c77d52f13a5bc1a36a7e9c15c543b6b446581569201f1f36d9084853
font_01_sfnt_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 10988 bytes
SHA-256: cf1aade05058912b3ec3e8ba98cc2a8b647ec712d54d68c57ff9b00cc9232a55
font_02_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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