Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51d4eb4adcb94aa…

MALICIOUS

PDF

96.9 KB Created: 2021-07-19 21:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d1cf84686bca3498efbac10a00066e17 SHA-1: 6a5800f58effc4718b5691bb6e7ea2c6535fa4d3 SHA-256: c51d4eb4adcb94aadba4fb275b9c583dd44f6a5cdbc5ed7969f0f1b1815035e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also features numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/1c9a7c1f19e24c68adc624f482946043/84261903316.pdf In PDF document text
    • http://www.polni.si/Images/files/73882942302.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b22fb8a50df---botuwobinuzoril.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/tebofimifisevuzera.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/h988v7hmgut279ne6m262frmns/vawisim.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737686bdeab---68790161571.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///74613678969.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf83e2b5207---retoginokaxupadiwimat.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zedijanofixiredebi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/o9p5o7gpni6ek7ak79t0j0d576/vepurokimiferewilisirimis.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/penezujamezubevifuduzox.pdfIn PDF document text
    • https://retta-bg.com/userfiles/71563536987.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/38b9257d90768a6bcd9ca815afcb96d0/4077389839.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/motipaxakebidofudox.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/888ba0ed56a9d494b84773a91399a0f3/xifivegase.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/18336638712.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/7a5e9ca8f058b15be1dba66c80159c48/27050868127.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160845fd0d5c55---97303772781.pdfIn PDF document text
    • http://domainecomps.com/documents/files/83806119636.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d27de5ca2---59094113348.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/92358ee83274530124e20227be1a9238/95744952918.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b3f07e12---bifofegapaxelikanad.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/zivutukudenekivebibif.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/92c63bcc6e0e00b15be8f25fe4b6eade/79864511793.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f74a1a59d---vegutusewixateroni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=counting+by+7s+pagesPDF 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_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8C 10716 bytes
SHA-256: a6f35db18c33048ae441a321ef3d38c050072c39b0b6480576985a738561c324
font_02_sfnt_off0001483a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483A 17052 bytes
SHA-256: e75c6581be9352f1065e8f40886df1d7fbbd0726e62e7a1d4caa83db25b82ab6

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