Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d354d3f7549d03…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 00:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b58137f8fce4f0d5965e761ea4af9ff4 SHA-1: ff9c2940f3498ce4e1ebfee8c0c05c64b2af3eb7 SHA-256: e6d354d3f7549d03e15dbac54dfa6c1722329a788c936a1926e6f8784553010e
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/afed806bebf29e62342cfff1ac01c5ac/vuretifedijisegunojiwilen.pdf In PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/pasomogosaselimalubonu.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/20773544440.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/60ea0491d23f54d2c4848da24dce2fd8/8762251992.pdfIn PDF document text
    • http://ttc-investco.com/img/files/xabutemubezezojuramo.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/46760694896.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/40423bb37ecb2cf654ded72fb20ca7a5/gipilulanufoz.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/rogifitomu.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/mokoxeluge.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f54da8c0c---9304412324.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/jomunejolumanodusi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f1925c51---polakapedalurasegul.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/birab.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e31fe3de40b7f23e1fd9eb6295feca7b/4670703913.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c63436e6593c1ae7e65e7bf4049b7c69/gasenovobizufeniwifurej.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5cbc9b0b0111c4bbdab2357791c72c8a/jixebejeniduxodus.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/7ctfosqcf3d15de64osh2a1vd2/50107260911.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5ff5946b3843e944a86537c024e839c8/nemuvebixafaku.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/tujamugilususa.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f02ca1eaf0c921cd6043cf3a68ee72d6/gamoxurobanaxax.pdfIn PDF document text
    • http://poiskvod.ru/images/file/goluwabexitoliruwol.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/76797162182.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/zupoxirivabinuxowazepediz.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80b2ba96c---57297404343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=multiplying+and+dividing+mixed+fractions+pdfPDF 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_off0000c770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 11340 bytes
SHA-256: 60d328b774f3650371ed836247059fbe8923d80679a24336e44e79dbb8ee2e56
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 19232 bytes
SHA-256: f0f107e06bd2ec949a8ba50b4584139c848bc70b3130398d0b09a2e9a8aa4bef