Malicious PDF — malware analysis report

Static analysis result for SHA-256 1981d44916d2bdda…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 15:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6ab723a70c2aef23fc0b4cd5e4882107 SHA-1: a60a1aebb9e17f62b65a29ed5bc0a842c505d0fd SHA-256: 1981d44916d2bddaba58638b3e47beace2de74255bcc6b3166e1406782ff189f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7642

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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/oo86tllflcm4pevn81742gh7rr/39979749032.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aacefc4c339---zapararijukad.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010fef5a46f---molelido.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb0218712000c6016281d3cde9c24825/42705139080.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/70434483190.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/visonitebasumuguzofulesu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/83a570607b526f403f6ec4d63c61da84/98007679704.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/24960818908.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/66177318982.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a7bbf59f---zurimisixanaf.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd015bd47f---27919039190.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/74615450414.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/xezakavub.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/jirokekig.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2835a54e7---68098897896.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/af0ed6840915b9b00b268e08e527657a/mizedilesifasemuwelegiba.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/xipemogu.pdfIn PDF document text
    • http://willbramephotography.com/59749481108.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/6471252859.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/pevuku.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf367dd66---jepunujadopexudog.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161197151d07a2---15292884403.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6eaec1ab42130cf6cac1c64a0f27c78f/41760702331.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/pizoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=graduatoria+medicina+2019+pdf+miurPDF 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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 11168 bytes
SHA-256: 6e9804c11dcfd8faf0ce1cd6910cbb902e978e223e69281da82443e4ce32491a
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 18196 bytes
SHA-256: 449d3ac4aa68982d0179017f2e23463cf732c1a772b23eca4cc69fe7818edc5a

Open this report in the interactive analyzer, or submit your own file for analysis.