Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d237023d3eb926…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 01:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aef4f04e6c0cc36af0340497cfaa142e SHA-1: 84df9c458628b88f0a212f9c4d03f078a4f8946c SHA-256: 19d237023d3eb926591f5025f4130fc3721e0b0271f681acbc2c9785e8a70191
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://krisoc.ru/uplcv?utm_term=engineering+sciences+data+unit+pdf PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8af8a519af84af214034e4fcdd4bfeb5/bisitefuvozame.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/bejisu.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210621110619.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/36987975293.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b056ea7421---gugekow.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160786838e264e---panivexonatadoxo.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/bakeg.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/83017202556.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/kewumiluxubigatatigugef.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cef5a0107e751577c193ee998c75e9fe/taxogevuji.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/31606289549.pdfIn PDF document text
    • http://trevorhannant.com/93792646868.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8d80a236b5d7294760d2c3356002cd97/jigizubijofof.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e16fdab07---95569074010.pdfIn PDF document text
    • https://kopari.hu/files/file/kaxegozosuw.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/zazasemowagetawowulotit.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/26355053751.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62d89c4b6---wagos.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/90872593627.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/poditowabituwoxumejobupaw.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/59171921727.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3bf2b0bd93768115afbfacd9495850f7/gebugegutulunofedajo.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608015d4cf397---74527891149.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/detifuje.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/69238811290.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/1103409858.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_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 17260 bytes
SHA-256: e113e2f056c9a0bc6d218eda2a9ebfaf37428c73300e902b81b68bcd7f49f913
font_02_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 10712 bytes
SHA-256: 9db7ea735e5e4da18d95e550667f49f8417413182f477ac6f8e0d11d144cde6b

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