Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e7bb5249e2fb23…

MALICIOUS

PDF

66.9 KB Created: 2021-09-16 16:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9db1e5a30435d2aaa6d69b2971c3fd4 SHA-1: 86ad092f59b818cea8d37df33979b2de9a4b97ab SHA-256: 62e7bb5249e2fb23ab1883b00057e9dbbf9629065833f1955248002db02e59a3
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 websites that appear to be part of a link farm, with some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6279

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 http://begues.mobi/userfiles/file/tepaf.pdf In PDF document text
    • https://glbtrader.com/userfiles/file/90027242531.pdfIn PDF document text
    • http://kodemari.info/data/files/44097048415.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/jowisev.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///36105497889.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/lakitufokuv.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614218c862650---davorudurogeveweka.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/82236647686.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/fubikug.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/pepekemapomejavaxil.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/runidugiwebodexume.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/42218997455.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22675479f---3958576655.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/werapejimibifobesufepal.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/jusuj.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/44388273182.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/45008466714.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140e40e08ca7---14207778791.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/93724812085.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/kisefamuzoxew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sultan+full+movie+watch+online+free+blu+rayPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/76020857438.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB922 11016 bytes
SHA-256: 24bb236fc245283116a18ee1001c4f45c9d25892839aeb63d68e35a24a65eabd
font_01_sfnt_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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