Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a56a3f4c923ab1f…

MALICIOUS

PDF

49.7 KB Created: 2021-09-24 10:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3d77a52546f12bab801a2b64a0cc28fc SHA-1: 6070f21112ec93a0846ac837eb5da589a6275773 SHA-256: 9a56a3f4c923ab1f2468e330ce03859394ad8df015f665a299b0fdad5b5fdfca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URIs, many hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5463

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 https://laborke.ru/uplcv?utm_term=klondike+adventures+cracked+apk PDF link annotation
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/32360799737.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/3345006592.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/32568280839.pdfIn PDF document text
    • http://espwireless.net/uploads/file/22984607755.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/56318598760.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/98580518058.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6b29718dba22ad46d0aba2f65501ba05/javubakije.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/14819925370.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/pizuxonepolulabenoped.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16147cf7cec143---xurijiwatovesuriwusa.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb6bd6d4c5---59233518691.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/vagepenebijafagujaker.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/99121694797.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/vimon.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/89900200740.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/xitaladapaladisiwudaw.pdfIn PDF document text
    • https://topupdana.com/contents/files/14157560640.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/39549133572.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/vovekum.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219388262458.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/pafebexabatigovik.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/xolesire.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/65091792294.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/75070131201.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/33909101571.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b01de1b6b---gujadevexowaxiw.pdfIn PDF document text

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