Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff4c9d89f442fc4…

MALICIOUS

PDF

109.5 KB Created: 2021-07-26 02:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 790c17e91ddf0d58548c31b8d33a7996 SHA-1: 0bac8bd4be74cc79440e515e4ac227968ad2cfa4 SHA-256: 7ff4c9d89f442fc4278eee2206d138dfe39fb5a33454e8fefa07bc8c05889493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely initiated via a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://stopserv.ru/files/file/43337694124.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b544d4f838---pukanozojiduk.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/remasorexelejido.pdfIn PDF document text
    • https://langumeistras.lt/i/File/26818341460.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kamufukewejeguju.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1f6a576cd7a2c1c98b007c801dd11197/zilukotasutigisirupof.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deab143d83f---73127732529.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/58d2247fcaecb59d30ba86f2730a5da2/fozizolubumatowe.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/7o6n3fqit5if74cibevf30lc9u/tulow.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/29874681919.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a93cd577887e7aa9ccf40e0c3745702a/zirewej.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/najadujijoxozevexedubumeg.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/19183420551.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091025d4bd96---29162385048.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/83387100849.pdfIn PDF document text
    • http://bjallstar.com/upload/file/lezimekedevix.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/58038146709.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088e2d9087c3---31739197025.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/pawijotasodo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160789ae78cccf---joxidoxopijiw.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608581159c72f---zasedarogisusibuj.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/33669184196.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/33ab88be27d40529cabb9bee57f84f6b/neragisuvobikev.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/q8th14ihqs69t6a1ogq1cvrji4/80684973734.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/8d1d393ec049a4c8a2616b9ee6b617d5/repubuwuzob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+reset+a+samsung+subwooferPDF 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_off000145ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AD 18948 bytes
SHA-256: 85d74ba403fc44a7a5b26704ee0c113c4863e14bc8828871a5ea6a1bf081a98f
font_01_sfnt_off0001772b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1772B 10736 bytes
SHA-256: 9706723d8ad9fcd97ac0d6bded631999b3e2ae80b3c97690073d5f667ee044b7
font_02_sfnt_off00018ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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