Malicious PDF — malware analysis report

Static analysis result for SHA-256 c521633b99699e88…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 23:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4f5b48f8fe4f4369a82b78342702b1a SHA-1: 0c411e7332ea9b4778c1fcaaf8d6925abb813d8d SHA-256: c521633b99699e88843b09e0128264ff8a9259c329b3d2698d41ae6d45ff26b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous external URLs pointing to potentially compromised websites. The PDF structure suggests it's designed to redirect users to these external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the presence of multiple external links and the ClamAV detection strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2548

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://wastran.ru/uplcv?utm_term=writing+a+letter+to+yourself+therapy PDF link annotation
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0f2462e2c507a40a0bc7cfec13a4fb38/63998506217.pdfIn PDF document text
    • https://tl-systems.hu/files/files/67177059838.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/xadipamaxenifefuwun.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/dirowezetomi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/93710708586.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/o7bufsuco3dppm7o926it8mpr2/falunodimiwulevuk.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7vouurkc65ronko2s8pj8kfaba/kawafudubilukuwugipitu.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/3505660542.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210624193355_6xezb6.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///pakifurukapejopudiz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160785d3600762---78613877436.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/58546440736.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/0qacf1m0htb7kv2896hq3m8coe/36128959000.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/42126710687.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/heqgbo0ju620bkvj6hpr34gp2r/92234563066.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/h7k46934njukr1sjgbv0dn56sh/tudaniwoxivuz.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/dda38a80ff1dd26b82bd11f7883e1bca/gedodagovajibanebebofozis.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/37896580904.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bd6598e9609b39b078aebbfa22d5aeaa/62938941068.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/be92c66350293a7800843c6224f20264/pugimexefuvilopet.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b0270261690d00ca68e571bcf056c8cc/kibupukeno.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ef8f3905557b35ba6b954f79333f2297/83300279340.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b460a9d021227d01b520b9d8ccd7abf8/79742140634.pdfIn 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_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 10844 bytes
SHA-256: 1501459ae50a352507754f27a8fa007c89797e81be9d86a6d76bbef45dc2a490
font_01_sfnt_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 17256 bytes
SHA-256: 9d722ac8b625e0faa9d68838281875f0c018db7f3a12e88d386580bd024fc61a
font_02_sfnt_off00013c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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