Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc6dff7cc92b687…

MALICIOUS

PDF

54.0 KB Created: 2021-10-01 16:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4952e8f514ca8245702d45b365c53888 SHA-1: 02820dd52f8b782d60fa4cb607ae803ff46a4af0 SHA-256: 5cc6dff7cc92b6871d40b77357f4db6ce8a219eb9be7ee06ce174bdaae9d4a13
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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8290

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://eijo.in/ckfinder/userfiles/files/13183262527.pdf In PDF document text
    • http://modern-pro.ru/files/file/50397047213.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615592a85a214---taxosefanewabalaja.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/48625248568.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/50861342504.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/wiwixurisafidiwono.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/sabirake.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/nawunudabijonigaketivuj.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/lurutanimojixikin.pdfIn PDF document text
    • https://novitas.ro/files/dabezepugetojoz.pdfIn PDF document text
    • https://temahr.hr/files/8276939314.pdfIn PDF document text
    • https://raljob.com/userfiles/file/97119412671.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/38047403685.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b98c7cd2e5---40979844511.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/53331703227.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/99620046721.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/valajepiz.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/jepakuz.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/rukuxumelomesutelifonim.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109151334534884.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/37588272140.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/37gihefssohuennb22u6566pe6/tefudavid.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/33139379448.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/janoranuxixabuzexeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=call+of+duty+mobile+wallpaper+for+androidPDF 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_off0000b1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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