Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4bd524b775eb80…

MALICIOUS

PDF

76.2 KB Created: 2021-06-25 22:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f81deeaf54dc4c436235e51e4b32df3 SHA-1: a3d4434eae707900a1678ee495c0ffcedf48e219 SHA-256: df4bd524b775eb80fb55ac62df24e0b1c35859fe1640a73482cadf7189ec561e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8142

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=godzilla+versus+king+kong+movie+release+date PDF link annotation
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/01275a3381cace9dbae63bba61a227db/dibug.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb682d9f5c---vibozuno.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/43fdcd2e948ba8b18ce196838aedb022/zazuso.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9e3c264ee563e640454fcf8082480d22/15973176324.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c51f4a14ab2ef2c39f46ed0e302d9efb/77799620707.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160978be3a08ff---7889342166.pdfIn PDF document text
    • http://beiks.info/public/file/dedadupipapafuvit.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/18355780887.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kironazowivasu.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811de5d00a9---71496096769.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qq49e1mb6u521q7i688pfhrvhd/gopolaxonazabuzalo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c0634c07ec0746015504fa5e1ebaae98/26095294004.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/marolipagawid.pdfIn PDF document text
    • https://morabia.fi/images/file/41366196559.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/530e3ebc3461ad38dd7b3a0d5b030e9e/farib.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/79481635249.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/da01012c02f2f6d5eafc4e0582956b0f/60231224804.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c625ab7f256---rutanisazu.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/kutewemaralujonivojor.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/952232841b9c54279d3b06c0418842ce/25890878888.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a03cdd378e7---mitovumipujege.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2ikhoia2re9bka3vcfphvq23cv/vuvoz.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 10948 bytes
SHA-256: 58d1ea66dbd7a2e898bb3431b4485c054af286df8aeb1a578f7482d2bee70807
font_01_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 17940 bytes
SHA-256: 34f7683f43db21e96e01fe0a439129e0ba41f1e7a2ba8a26f89a17e3640647ba