Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab253d8e87f01ca4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 18:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f4d2b45db85f1f85ca5e6c76838af0d SHA-1: a8d1d03df2ef19fa2efdc3856584bd1a16e5d525 SHA-256: ab253d8e87f01ca4c16ed7796de643cf2e56409c873b3505d6d2e5a8f024c3b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

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=download+san+andreas+apk+obb PDF link annotation
    • http://langfordfinancialservices.com/userfiles/files/lezakamuwuzonimofewebo.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/3157366529.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912132334464231.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/cr52sjnh5157hdd2nrjej5mmt8/66341226516.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/77695332733.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/62345994086.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/murude.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b507e0f9e---45220344577.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613297e9abe04---pateponoxumusubirarenateb.pdfIn PDF document text
    • http://julianina.dk/upload/file/nozoxixaz.pdfIn PDF document text
    • http://belean.pl/userfiles/file/leramoburek.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/54621367793.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/vipevakez.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/lafudozogula.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/85197866781.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/xepekapuzuboj.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/9542396068.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/91721552887.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/wumexenobuduvadebitamu.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/7405281309.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/21751305747.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/fabolewudenuti.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/80006701892.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/49574726538.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_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 19672 bytes
SHA-256: 93beac501af568f85840e57a0c36139314d94d72f28461261abebe151aed2a11

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