Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fe370ff18b3efd…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 22:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0a5fe8727aa5298c9c3c5da3b498f45 SHA-1: 12cee9d47b0e3ab00a0a767f1c5330be7ba0919e SHA-256: b3fe370ff18b3efdbe3335541e2fe75fb5ba23b2f8461a04879d3bd6654cbf3f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4870b192b2fbce8a14ad07368467b3a3/mibokozuvubupa.pdf In PDF document text
    • https://asiarsolutions.com/userfiles/file/xudugizod.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/41602733349.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/82517624788.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082671bee281---zoxefalete.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/93247766163.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107e0c3bd9---48564144750.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/97378403434.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897d36737cf---59094017704.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/fodokovumemu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1f8dcd83---rufumumiki.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/fumovabitizarudige.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/xopesafowerumakiro.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/tananifum.pdfIn PDF document text
    • http://taociren.com/upload/file/2107292114374394515hird5djlzd1.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609df00b311eb---99519161451.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/winedatevad.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/18871869866.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/01860310ec9abc75d2886b519e8277a6/rudavopigafe.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/60708431001.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/neletazerefejusam.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zumemowevoxubevexulanek.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba042422ba9---17631174621.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160866fbd3ab56---98935052809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tsotsi+book+pdf+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/sokewosekujotowewil.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 10540 bytes
SHA-256: d9461586227bcd8c75dbc50bf2e1b67cbb1fd5e332a507ef4519a3bebed48079
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 16004 bytes
SHA-256: 99a32252abac60c1e6b2265c74178452a2a0f4380d98a64a16852ce835c077c8
font_02_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1