Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b33ce70955982db…

MALICIOUS

PDF

96.9 KB Created: 2021-09-04 16:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8341f1bf51b776d0db9ce3ee461ff225 SHA-1: 4a4fdce409ddb4120d5d305c139862e619e26209 SHA-256: 7b33ce70955982dbbd7a421c20a0bb792cfe4126f0e5ff0271a3057358dabf88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. This behavior is indicative of a link farm designed to redirect users to potentially malicious content or phishing sites. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier clean score 0.2392

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://publicbridge.pl/userfiles/file/21991227996.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/55a10f8b84d48e003013ebdcf1df6e7b/14879125452.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/polotavonafe.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57b4ca0ce---vowokipok.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/zewanojudaduxajotuwebap.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1c5ff7a54c1fb9ea3122c458ba1aa525/38186676448.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/sumirejikijupuxor.pdfIn PDF document text
    • http://demkapi.com/resimler/files/pafemami.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a2ba3dbbbaf628d8fbb12ca1df051f4f/72533677471.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd27a871f8---45252079296.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/36250511641.pdfIn PDF document text
    • https://masihpt2.com/contents//files/xapesapadowoxifaga.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/22510948208.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/mogep.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/raselugaxegex.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/miteganofexanunuxekowujam.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///74503128273.pdfIn PDF document text
    • http://sparkpro.lv/content/file/woranifodanovabun.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/zonirakeruze.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/34487330959.pdfIn PDF document text
    • http://pvvc.cz/files/44131612772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ecological+design+principles+pdfPDF link annotation
    • 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_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13930 10680 bytes
SHA-256: 34e01d5171bb996dc5c5509223144a4fff78e7e7e4355afa6a3af52c6b560c84
font_02_sfnt_off00015186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15186 18868 bytes
SHA-256: 8e4e5beb1934f6964a4bd00ba6df9c57b5c3f3a69594d5b18c94e59fbafcad31

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