Malicious PDF — malware analysis report

Static analysis result for SHA-256 04193da938f74b08…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 14:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 823621d9fc8ce550beb7c04d127e989e SHA-1: 16888b936237f62370002a41c63f779339efd489 SHA-256: 04193da938f74b08eccfd0ce7b441ad9de778d58d933a9829dfc537341bfb336
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5563

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613de626d4914---81135614227.pdf In PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/kuxurufezar.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/70891927193.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/48262162077.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/tabixonufu.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/63965987182.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ab136655---29328459853.pdfIn PDF document text
    • http://konberdbio.com/upload/files/pikafigakanijofilidoro.pdfIn PDF document text
    • https://rintrans.com/files/sekarexujopikagudexum.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/55019954257.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/63492124302.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145499add263---872059580.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109112347395552.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/1546770482.pdfIn PDF document text
    • http://esteel.my/userfiles/file/21135699504.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/pumemuzajuludokiziteloxa.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/0daca3b1220583ce49c647be670b8509/82243424355.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/gixazofibanogojuwukunuz.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/95523798000.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/zelesupofixupugomobegajod.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/finonewemudejiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=plugin+flash+player+chrome+androidPDF link annotation
    • 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_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 17368 bytes
SHA-256: 5789300ba3983509b5f60eb3ebda073d4b439149e9058ea5ba85b86bb07415bb

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