Malicious PDF — malware analysis report

Static analysis result for SHA-256 559f2cf0bf744f74…

MALICIOUS

PDF

62.8 KB Created: 2021-09-10 12:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4036c7bf50e4885f2abc7cbc01078c0e SHA-1: 0a7f8ed5f6b27089939dfb3aa2aa1de59691abae SHA-256: 559f2cf0bf744f74e6bd428477f40b01089c19f7f8f9a3f1d5242edfa91aa420
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8315

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://apskarota.org/userfiles/file/34015928188.pdf In PDF document text
    • http://www.medicellbank.com/userfiles/files/33827050784.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613646d52d086---92658071443.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190ac8c2dc---18503691137.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/javiripimel.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/vesizujisatujagope.pdfIn PDF document text
    • http://serting.eu/userfiles/files/99536055479.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/xikakaraxap.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/wuxagovezax.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109080910364867.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/deaecd1a335dc363d0670c69e201ce1f/nolenegig.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/74952252868.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/94823832542.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135face731e1---zanizobajonagol.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/60095728294.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/24184230866.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dp75hmlnflsffuvr7la31dgcbn/zutowudevixemukategezinad.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/52977053516.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/sagezixerilegubiwam.pdfIn PDF document text
    • http://chicopharm.com/upload/files/tolit.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/lefari.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/68996850826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=clock+vault+apkPDF link annotation
    • 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_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 10060 bytes
SHA-256: aafc59642f3c7f6a4c77df443c77833970f3e287020c84f3ed11254c6b3ad1d3

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