Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e6310b68d690f4…

MALICIOUS

PDF

99.4 KB Created: 2021-06-30 22:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2ab46122e75f222fb8b04f204e45d9fa SHA-1: 5626b4ed49e351d3b2baba9f86f7b1225ed004b2 SHA-256: 91e6310b68d690f439446d33b7be82f3dbb5c2b1db6d48e23a2cb73b19bf5fd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc6fd6ca2---sexil.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb01b6212---woboso.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/ef7bb0402d77d874c878d8ee56cb169e/60879844865.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/24868465151.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qbbrtmm7qu21krgg4kvh4b0l2j/gububolisexigebepulaxajut.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/79971926734.pdfIn PDF document text
    • http://alkanboya.com/files/file///lowugemosamokesodula.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1965614e1d9884d653cac67640237bae/wunawukawixolufigol.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1b6acfcc27217c057d5c6d2e8e779278/labiwerebinufos.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d038a9aa34d628c960fd5f4fe597ec5/rizujuromo.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aaa3c8197---pasakujozes.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9f45d0668---9799122978.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/42530757373.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/maximesaj.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/1198526559.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fed6ecea15b2ff4160efb5588f04042d/kafer.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5e056f14---zawatoxip.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80182729343.pdfIn PDF document text
    • http://esistore.be/userfiles/file/sofove.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/83149907686.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/luxijaxexowabumip.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c08e3137---35316120924.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/96nqlliv0gt29pr4njmhc9950t/27685710021.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/gonanunuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+point+of+concurrency+of+three+altitudes+of+a+triangle+is+called+itsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 11076 bytes
SHA-256: 28f45852930f01679f63b0b91c8fc1023cd590f40c25a8351e32dbbcbd0d028a
font_01_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13961 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off00014e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E92 18556 bytes
SHA-256: 8f7ebe9b3b6d07eb0c093b1adc8f809644e8b4685da0ce9f9e343aaa6ca88986

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