Malicious PDF — malware analysis report

Static analysis result for SHA-256 363fd82e61fd0997…

MALICIOUS

PDF

137.2 KB Created: 2021-07-17 18:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf5f235f6bc15ab1e67f5dee716316ee SHA-1: 73341d73f9cbc3b22523905dd07d053b2a18713f SHA-256: 363fd82e61fd0997c23f9b0c46d2f065317c462911834f39757bc4228fea477b
124 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. Multiple URLs point to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' further supports a malicious classification, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4818

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://suachuaspa.com/upload/images-content/files/61081338650.pdf In PDF document text
    • https://eseninternational.com/uploads/files/99344298962.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/o2qf372vuc0ou1ks54qgt8q52t/22508187448.pdfIn PDF document text
    • http://atek-ent.com/upload/file/42869830743.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/74615301342.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/jumired.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/36432167134.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/55896704497.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/999fd332f157879e8231ad245349a8fc/biwokibabiruke.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/63116506914.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8c40185f---purusunesene.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/85034713920.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/96376646125.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a0e14edb---63605603528.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/pejodixuwurezudogujakiwo.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/48809149963.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/72349463388.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/56765180063.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/945086494.pdfIn PDF document text
    • http://bienbao.org/uploads/files/75514729530.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/gifuwukobaz.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a77c9e256b8bb012a5357ebb820c5459/38421976530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=in+the+days+of+noah+documentaryPDF 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_off0001d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9AE 10768 bytes
SHA-256: 7a5d465a57dc4e7b8179661f891effd52f8eea4bc972ac3beafc9c5336c9302e
font_01_sfnt_off0001f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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