Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f591788821f8689…

MALICIOUS

PDF

95.7 KB Created: 2021-07-02 07:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fad8385bb5a313ccbe918528e9d72677 SHA-1: 3ab9c60a12513723a4dea36af5f072727cc0680f SHA-256: 6f591788821f86897a1a9807d8b091ca767566a82fbb71ebda2667b522301fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/87084771268.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c15c8bheqg7is4j0vqme7fn5u0/reviwu.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/c2c62920b0a2ce2304e0496bd0f2e145/69360810484.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e049a0e11da00a99f548036b8ab768e7/wozewamu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098450b41407---roxekidon.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e821b2189---rogosedibil.pdfIn PDF document text
    • http://dentherapia.hu/files/file/5523637272.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/pb9egf13ulue67f8to9nip37rk/zarivawasewopokesazem.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/jowanenijig.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/391fc190e69e29e30d9bebbea8b11593/43641007344.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/pilavibemafi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a324f1df2---68341664145.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/kurazatujivot.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160846e29c48e3---zemivix.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7b9bca3e---48677331603.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/4126162374.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2426fc62c1---lirodokewewakarelisediral.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071131da396c---37877238699.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/58985047910.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d6d2f3629---28642618492.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/88051230807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=you+know+the+spielPDF 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_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 18340 bytes
SHA-256: 94049fc78d59d9e4e7cb22c33479b6fc3fd0156b38e2130940dd4628fca69c08
font_01_sfnt_off0001426b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A82 10348 bytes
SHA-256: 54fd141adfabe771b57c71b2fd11e554c2f0751f626308ebaf441aca8aea6a56

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