Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7ce40d18ea96d0…

MALICIOUS

PDF

126.5 KB Created: 2021-09-01 01:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51fd961256caca1b358addcacfbb6849 SHA-1: ed17e2449ba3ebf7b50ea549cbc9b3d92a2cb45a SHA-256: fc7ce40d18ea96d06eb4d8f910792d9672bb48c611e32ddc00e2bb77bc2493c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress uploads and disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://badoza.net/userfiles/file/wigupavakikujubega.pdf In PDF document text
    • http://jiehuist.com/userfiles/files/74070466166.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/15212735563.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/rixozevom.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5047f24fea250917f319d014ab85e40e/pinakaramuliniduxutewatu.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/farelekotofez.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/rawegod.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/lofuxapa.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/69683139e18b51c23bb157db32406751/37474575308.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021080622273973499.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/66551638656.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/40488946358.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/vixobepilajutotas.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609841042d302---tozudoduwumagoxisawa.pdfIn PDF document text
    • https://uudanbury.life/files/file/82505770887.pdfIn PDF document text
    • https://nyig.com/files/file/96918895225.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e709b7627---xanakunubevudalud.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1376e72da---70220889496.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/melenewekolipuw.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/19123697722.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/58706579195.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161140bb4bf06b---zosana.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd057f359---6414291258.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/97209459559.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/komen.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/bakotesurake.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/80252664146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=atom+model+project+ideas+examplesPDF 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_off000185a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A6 10784 bytes
SHA-256: edbb10acc44f8ab8006da78eca99e86744f72ef688ca9b8d1f484b78c6beb5cf
font_01_sfnt_off00019e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E73 19996 bytes
SHA-256: c3ea0135f55c155d5c8e8949371a5f7bdb8f2fd9f9751bbf2885b084f7d3cadd
font_02_sfnt_off0001d2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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