Malicious PDF — malware analysis report

Static analysis result for SHA-256 d728df13e651d1ac…

MALICIOUS

PDF

68.4 KB Created: 2021-09-05 20:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f72022657eb7d3b0e6f6959c1ac7b58d SHA-1: 14be213b4efad93b5162af293d5e346558b4b7c2 SHA-256: d728df13e651d1acbe0df054430d2c11b2491f4c6d05cbf7bc0ad16ecf1b6c48
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6460

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 https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bd9ef2766---wunalagaz.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab3d5e11---xebuvizavujuvimoxax.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737db8b4b2c---6070865577.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/gipibojadamurogesek.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b211c936---77660581685.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/3971337582.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/79169996042.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/warerevisiluzix.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/17215448602.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a015eeaf7---61601377403.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/90341814419.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3223ffc5---wixamopin.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/76287426963.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/fugupim.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa7c0cd94---83565110337.pdfIn PDF document text
    • https://basisnomor.com/contents/files/wibofoxawadixol.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/mozapuzidebapinubow.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/57708191649.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1629738011.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/63409827232.pdfIn PDF document text
    • http://finvestfortune.com/admin/userfiles/files/4990428397.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///rulamexejakulidukugekowuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=system+dynamics+pdf+palmPDF 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_off0000bddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 10752 bytes
SHA-256: 47a2abac761ab0acb5d16163e9ec20359930aef6d0715f3491d6fc48b4099128
font_02_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 16396 bytes
SHA-256: dc74a069f1daa413fc5751913e89b6af15cc9297b7214634c3f183d8ba45b0d1

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