Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f4437dba20c93d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 23:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a6ca5e330dd8ccbe105841fdb3a4675 SHA-1: 4e6919e9c980b4b8a5737b280991718eb83c5199 SHA-256: 90f4437dba20c93d102c9bc4c9d859151478cabf792f5c971c6ef7bea20841a5
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains a large number of links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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 http://menafundinfo.com/userfiles/file/48120682605.pdf In PDF document text
    • https://pjkconstruction.ca/images/file/badorara.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/67673275734.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/mijakududike.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/lapevanuwox.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/44404911075.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/12184366408.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/96205984533.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/53208760683.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/zuwurevajin.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/p62dmf958pk151sb0nt63obs1l/76448560425.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088e46de84cc---47596860923.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775edc4adb9---sadiratiz.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/metemukiravuweperolo.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/tilamoxorokiwa.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4a5e18965---89803077084.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e935f5a524b---vagobavag.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8b1f5e7a488c5f631fff9e22d553ea65/jelesojebugugo.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca69ddf65---gupeketekisozop.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/m7skbmrjscjveairuhcigag370/40606851531.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/q9iv4g8nr7hl6dk3rjfr5lehg5/60758100448.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/43234556100.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/gabowutukupilenisisis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=electrical+wiring+of+a+house+pdfPDF 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_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 17320 bytes
SHA-256: 8938257a97969fc6652bc9d855f7b0d94f30020b42419ebe29008965aeb81fa9
font_01_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1