Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bb45d7e9738f61…

MALICIOUS

PDF

53.9 KB Created: 2021-09-17 21:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ee28100007333469dc1e55165a0e487 SHA-1: 32a6c2de49aafed9505cbedf47c3b56b2f6f7680 SHA-256: a5bb45d7e9738f6104a6839b65a152a07ca1c8217487f8ec84caf1df01ea2313
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points to the exploitation of user trust to lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

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://ketchas.ru/uplcv?utm_term=wabi+apk+premium PDF link annotation
    • http://www.civilhospitalpalampur.in/img/uploads/files/22677724258.pdfIn PDF document text
    • https://ntc-container.com/upload/files/67507404307.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/rojaxepalevokolitalorix.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/22066928587.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/41422923573.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/68728461122.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/gamum.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/36969659017.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/64503301083.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161411794a1478---82379756484.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d13bb12697---pojuro.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8184a39b3---35948230862.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/51685528189.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/xivijapagugogepas.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/dasajoruzibo.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/69628230407.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/fodepalowudizazitemu.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/depuped.pdfIn PDF document text
    • http://z500.si/files/28567487034.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/87452500649.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/97934332602.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210914_6AF4A6A4CE4EC5EA.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/91102370338.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/kevesanok.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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