Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecf99392482fb7f…

MALICIOUS

PDF

85.3 KB Created: 2021-07-18 16:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0b2e7a64665a63a31878e63666b8dc3 SHA-1: bacc9436ca4e62ffeb100b84ef57b5737578d479 SHA-256: eecf99392482fb7fc6bf3d14ae0060c2d8405ba985571bc77b1618128aba67d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were extracted, the PDF structure and URL patterns are consistent with phishing or scam lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b8c4bc50d878e95d7616a9d136c7a3e1/gabujifuwifuve.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ls749itnp8hq32gb6i9ff9pp23/fuzasejefurunofokaz.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec7059cac---31395084299.pdfIn PDF document text
    • http://apvn.info/userfiles/file/16824881855.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076e58ee50e3---losonosomini.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/66771683454.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7820082043---46977776269.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/kovadimuzivusedas.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c03ebfa5343b00f3143cddd285542d3a/27688806082.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210501155951_1569814859.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b16df929dd8c2adfa1c48f1db64a99db/32695945452.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/373511682.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/batab.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc99437dab---83250243859.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b59bd68db---45201061352.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/73172931023.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92a53cb92---59861631198.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/pawugenewosadobudorazu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ac2aef52---33203703325.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/009l8a72683vj0lht3a1kulpa8/pibadelomi.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/nutewak.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73c1bea046---lubijadaf.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/7tve220mn2q6mca27vguq844i5/49085023673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=love+quotes+for+gfPDF 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_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 10252 bytes
SHA-256: 104901e6c0446c66d1d20910acee09d377377ef7ecd8f5eb7d81404e8cf217df
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 17496 bytes
SHA-256: 2048d23c0d1c25aa4776109b2ca9c9cf9be87e3bc6913b09a8a58452bdf4941a
font_02_sfnt_off00012eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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