Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ebdbf38ac29f57…

MALICIOUS

PDF

70.7 KB Created: 2021-09-02 16:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9d666735f1c8f91eedfc57637e3c22c SHA-1: 4dec649c0e87422cfa7b0b861d41ef1fe6db2dff SHA-256: e9ebdbf38ac29f57e7dcff0facedce53e5713b2a8334446fb2ffe7ef524cac21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005cbc66b2---87198026178.pdf In PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/15fb84566246c40d71b2a128a46eff6b/40341803000.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/64374149047.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ni8a5on9v01k5l4edbb5p7ch05/45112835533.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/j399hvs7c3bvcp0opeqarr7v31/76873112557.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/rovibisekituvipazikux.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/6463356192.pdfIn PDF document text
    • https://atiksigorta.com/files/9870643391.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d811315fc0---15348089249.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/zalizatizevotupetavi.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/25190038086.pdfIn PDF document text
    • https://menu2uplus.com/images/file/73611732412.pdfIn PDF document text
    • https://mollis.rs//files/gedekoredirumoxevikaxon.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/gezamives.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/52999404812.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/jumoxoguvudokup.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/16370307677.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/52984676894.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/12059683405.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c91b333ea5b39e106bf897e4c96507dd/vubotu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/99192682200.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/vamujosiserafodup.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/30402500801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=adding+and+subtracting+decimals+worksheet+ks3PDF 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_off0000b0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AF 16252 bytes
SHA-256: 7a7f9430c54955cfd92fd983591cb6457620f99d5ed67ba6d8921e8c81fbb4d4
font_01_sfnt_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 11388 bytes
SHA-256: 871c0b9eead0621ebcd266bbe3183bfdbb1692b3c9cbaf94aebbabb333451681
font_02_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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