Malicious PDF — malware analysis report

Static analysis result for SHA-256 4008fe3733283ee4…

MALICIOUS

PDF

55.9 KB Created: 2021-09-03 05:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5981a9003894950b220ddf54bff6b4f1 SHA-1: 541fe14f650307cf43f63c01e9e940f85684dbc3 SHA-256: 4008fe3733283ee420fdf3dd8758af4271f2f38ebe86892068c45056c5831fc9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5046

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 https://synerhu.ru/uplcv?utm_term=ethiopian+grade+9+biology+textbook+pdf+download PDF link annotation
    • http://parejalecaros.com/adjunto/upload/fck/files/getik.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/23461694161.pdfIn PDF document text
    • http://biomisszio.hu/tmp/kizagawabegozu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed89759cd3---jogukolog.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/xujadulejubovato.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb381a1dda---36343914983.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/ximavimigakenuxon.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/flmj3c508tcpvtr932kn0rvnn6/deruvegimakajole.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4a69b5cda4c9f055db74eecfc5088402/90971781263.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/vezixozoserekerafiw.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/vemelofugujejuxizotizubo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b17da7ce70---sitikomizojowo.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/86269683528.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e512441f88b07f78af605c32ca8bf111/14351920129.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fade46de---siwir.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/30467208317.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/8rdlmjgve52g4ietb4c5bjt7h3/bugurebimaweganarugato.pdfIn PDF document text
    • http://premium-h.info/files/files/87895109078.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/xonusexabadozurekojine.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/nefororafavetepuzapedaluk.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/97369357155.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/bokifosovivitope.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/zebopijifop.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/31107968364.pdfIn PDF document text

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