Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd2ddf95aa531d3…

MALICIOUS

PDF

65.1 KB Created: 2021-08-20 05:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7937bc3e14d70510854cee148368c82b SHA-1: c56c7b07f4255dedfb3528bef5384c66d6a6182c SHA-256: bdd2ddf95aa531d3b8405420bb31f0586f035d03039e650edfb3e75e0adc3edb
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous distinct hosts, many of which are on disposable domains or potentially compromised CMS upload storage. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9521

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nthbu1puhqfe3qrhkrat08t9b7/39240155553.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/bdaa5f4e71d293f14f38423967c88574/mopeletijinetutoxadupibov.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/fikuxux.pdfIn PDF document text
    • https://bem-sa.com/img/file/6740285988.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85ba1c2af---rebajo.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/demakitunetefadapefuw.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/xiwatapuzinejev.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/b4f9f285ab3c1a3cca016b2a781d7bc6/85659669124.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/901987019.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefe7db0c0---15876313517.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/favolibumexosavikugov.pdfIn PDF document text
    • http://epicridesnepal.com/files/34312560591.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b45f98328902bbb6438fdc0c3d9a861a/46574456244.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/40874075651.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/86276290731.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/59d2ef806251d07b580b3efb735a59fa/jowufazonezulotufire.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jegijupitidoli.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b23dcae8e09cee8366295de512bbe15/20560493626.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/36229272326.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a70e46dd6---30422818754.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ebd3917f79fcb656f939393b6c833472/59754283062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=journey+2050+worksheet+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 10828 bytes
SHA-256: 7de6c25db7236981b979fd809e3d787acb9313846313a08f3896c8f6de44b482

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