Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd49d6c7e45cfcf…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 22:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e29f36441933d091939ff81b20aaf6a SHA-1: 61c51ef781a02d6f6c5974bc3be65edd5b121950 SHA-256: 1bd49d6c7e45cfcf8a17a3f3afecf9a1676cd3564467c73171757fac7a6e7ed5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites hosting further PDF files, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8313

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/0khdp85n7filubohvck3t0pavo/muzanegajeluzosikujulobur.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e8d14d5e458b19f322797ab1ceb44a3a/xobudadobekesefo.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/37868932237.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/faravukivi.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/totirosubamisegito.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/qavjoake1tjqd1st9h222k2133/duwesisofikomujudup.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3d66400593e483862f825de73a51c187/89684221124.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b912ce3a1ef72aabe006e6b8743b2b04/87711993101.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/bavirax.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/xukolud.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0966720c65---gametalotor.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/zosiniv.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a139bdfe---50200490646.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/88442419537.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/vinuruturofijasat.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/diberudowakin.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d3dab1b5f68ff7b3a745b3254ff7581f/99227479467.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127b9759a4da---sarilixejokeri.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a8895645c3163450f9967fb2d1691bf8/xereganojudok.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073f458b28e6---233233469.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2aqf727j8lmvptcap0sdq0ufdr/49387327641.pdfIn PDF document text
    • http://zuche0551.com/upload/file/68706388518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=simple+machines+lesson+plans+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_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 17228 bytes
SHA-256: 98729e8c8d0a20878c698ddd32e115f1589a6f8b8eea7806e181ebef65d655c4
font_02_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 10764 bytes
SHA-256: 3a9f4c4885d7af9d272fddb5785390135f40d4672ce87ac55284dfd1a634efdf

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