Malicious PDF — malware analysis report

Static analysis result for SHA-256 46556c0f348f76ec…

MALICIOUS

PDF

89.3 KB Created: 2021-08-13 13:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63062c067fdbb217870e67f23d9d1cf0 SHA-1: 508001d82644e60fb105b89b0fab7379f2dd63a5 SHA-256: 46556c0f348f76ececf20ca9f0f8ab0dcfdd7ca160ad08c7062ecfead1f7d256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO poisoning tactic. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://micast.de/wp-content/plugins/super-forms/uploads/php/files/t31v44688452t7ioskbkjliho0/jugod.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v6725lej9ubmtdomnojech9rb7/96568702285.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/liwamifabejovijizopi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf57aa0ad6---dogalina.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/wuwojenizogex.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ffb123fc0b51b744c5f78e3fe4cbee11/19590587110.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f20e1b5f059b8ab40e2bcc69ba4697e2/86372867647.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eb015067937e517f0b8e0a2e16e9ac8b/tuvagudejevemoz.pdfIn PDF document text
    • http://biosite.ru/images/news/file/vazesuxujujufum.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/11915443715.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/76863164101.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ab9ab1b0d54eadb2e2dfc0cce628c359/xirep.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2c4df3fcb6f0cecab1f135e49dfb5f0f/kejenexirusa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a3a41f14251cf69e7a88e724cbe3b2a3/21625282415.pdfIn PDF document text
    • https://grnca.org/img/files/files/zegisejave.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/genimamokaro.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b311b6b4ca2---8390585954.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de64d035df---faxozadugi.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/57980059899.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/71341645089.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36f863586a---50654886993.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8f071c67af174d3c9ee4e11d13ad0678/84419592524.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4slbcvrr284feo67ok6oq9ug72/robutarotubavawegotobemu.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/fafafivif.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/56602704536.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/81819673600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=counter+argument+letter+from+birmingham+jail+worksheet+answer+keyPDF link annotation
    • 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_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 11356 bytes
SHA-256: 9de799aa263bfe47c4a4961feb7ed62872f819a794c53d7e5aa5b4b9cdee0fb3
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 17184 bytes
SHA-256: e218de7eb0266918c4cd8c67360d282ec0f4af7a1528a49a0f1fefdec5af1be0
font_02_sfnt_off00013dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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