Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a90d8b690df3e4…

MALICIOUS

PDF

57.3 KB Created: 2021-06-19 05:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1655982f3ac64ad2018a0b8e5da6297 SHA-1: 5c81afc626bf8066b09e78767944368414e4c87b SHA-256: 83a90d8b690df3e47c9968e1a13dd044a49464e1727caa60f0089f45daa36cd4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6664

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://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759cf3b18f---nibuduposujejodakunutafir.pdf In PDF document text
    • https://artbynela.com/uploads/file/pegerasozido.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/86708101243.pdfIn PDF document text
    • http://sam-global.ch/files/file/jelog.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c31e26cff7515b099d734d183688c50f/rezedeforowebevawureruvi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e6915b04ccb01b14872f698731c57b5e/48500286453.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c18584891e---54830703396.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160904e7f2c3c0---jexakerupimufavifovuwa.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/wekiponibenikipade.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8eb23a4e---31891742310.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c3838ba7---68470255915.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/67951287346.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/97577686883.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51fd77f43---98470545580.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/40862388927.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f240899e4---74771071070.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/608a3ad806f9b37b21ed0915ff09a7a3/22188110109.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c701d2eb1af4c84b313303bd18bf235f/bebide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tv+anchor+anasuya+sexPDF link annotation

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