Malicious PDF — malware analysis report

Static analysis result for SHA-256 887ab000161e536d…

MALICIOUS

PDF

100.4 KB Created: 2021-06-30 11:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b03bf876bf2ce79e23d5cdac2239f40a SHA-1: be4b34087240fa70d58fba1a809831827d6e457b SHA-256: 887ab000161e536dc44db2b3f11d4a505a2c6a80d8d0cec8bc380267fa96542b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907113052bc---82202079893.pdf In PDF document text
    • http://ccswcd.com/userfiles/file/mudelu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/pepexutojorasikite.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7a725540b59a289599e86a376d3802f3/82448223863.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/5dcbb75f2607b63128c6925a3bbadc22/15566690654.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/c1upcuf55ob61s90gghtu2u7qo/welowosexonuxerotuvodifud.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c1df00dd---42744165046.pdfIn PDF document text
    • http://promador.pl/userfiles/file/61234480006.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a85c13ee0a991eae707a027f3e1e9d85/17107281320.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c91cac53cbb---40042395244.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084adc2bce9e---85945355908.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0098203c7d---49989167029.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/12d0a709ada2e3990b8d7e621628fa62/56597892053.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f32046a278a1df81077e0fdad4f26012/jabeluwenulufunomuzuwut.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd0f180fc851f8c3ab1c1586b7f4584b/sefodifurizenefaj.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sexunamimufemiwopat.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/3455346135.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/33b920e63fba116b7afa0314089bfb89/mifagogebudufelobug.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e53abb82---36083024378.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8485c412d0fd591b68b37a5c7c1f7b11/soguziduxuzufagipo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/69196360418.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/566d1063ef02d396e0db8e512ad23b0d/42831482704.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/73b1e9801d8a0a38162a91947f4b045d/50140156939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=is+sickle+cell+anemia+a+dominant+or+recessive+traitPDF 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_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 18084 bytes
SHA-256: bc57cd788f61f8f7421dfa714e4fcae7de013808c89aa62987ffcfa8e950eee0
font_01_sfnt_off000153c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C1 10640 bytes
SHA-256: 78870566d03ed3a66b496760e5a895fc2bbd18781ca3d385a08d26c78329e90f
font_02_sfnt_off00016c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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