Malicious PDF — malware analysis report

Static analysis result for SHA-256 6623f620123b7dc8…

MALICIOUS

PDF

70.8 KB Created: 2021-08-27 21:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec131920ff6c70ea7da633e7cbfb8064 SHA-1: fc302ec017b4c1e727bd419617d20934e2316973 SHA-256: 6623f620123b7dc890ce2436618caa5c3adecbe413bfc9c769e0e6294cbfdaaf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other potentially malicious domains. The document's structure and embedded links suggest an attempt to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa173fec397---18557535792.pdf In PDF document text
    • https://actorconseil.com/files/file/mewogez.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/61491741343.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/61ab64f9ff5b529990a2c0e69c644ed3/31356359195.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/76293313253.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975f2136028---345928509.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/96740480284.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5bc83cc32f275626d0a6f157ac2e085d/fixarudinujexas.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/nitepizomesupujesox.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/95fd1a566bd568178962fc16885f55f7/jererigebofalegojuxil.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/64383551063.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/aee150a0263ec409dc70ed3f14075409/89584725377.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/29248764715.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/786308cb726c08cf1bae41cf2c4e980f/51556882055.pdfIn PDF document text
    • https://digicpictures.com/downloads/89256645644.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56d330cf2---purixibixinodowavolu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62392fd3f---47966310705.pdfIn PDF document text
    • http://rentaruedas.com/files/others/21145552333.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77984d8a3e---99181658997.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/65765ed509d98a9d6051aaa429454fb5/63442874104.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/peromonugibuv.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cc9f60145---xeratuniloju.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6061c4730---67850470805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jobs+and+occupations+worksheetsPDF 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_off0000b781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB781 10972 bytes
SHA-256: cf1e022dbc0d1556e112c65847f11f9cab2dbc9bceb3095da52b465dde4f5652
font_01_sfnt_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 14676 bytes
SHA-256: 0e946f633147eb2296d2560c757b4be0fd8bb21c5f2d55bd18686df2e25bf48e