Malicious PDF — malware analysis report

Static analysis result for SHA-256 988d6d518776dd04…

MALICIOUS

PDF

75.3 KB Created: 2021-08-20 20:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e21cd8f6edf3447ca40af1a3a8f7e01 SHA-1: 1ec0b097c7bc568a053c16ecb3912382f240e977 SHA-256: 988d6d518776dd04169baeff0df0520da826b8529cf13e42384cc5e754d7d1d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b786fa15332---toluwazefomoz.pdf In PDF document text
    • https://ksdc.in/userfiles/file/79756623423.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/95881380482.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/fijuzerukexa.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/18043256720.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/bejolulovujarupasawej.pdfIn PDF document text
    • https://digireg.se/upload/45750422843.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lsvkg75ql7cv4uumfu2gref285/valisukose.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/waworeribadikabemu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab0b01336---rorireverafozan.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/mimozesixemutere.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5aa5402db72370665cc03816c46366ab/17152818861.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/43791671802.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2249621a---88950254243.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/74460827763.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/juwanoxevoso.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4eed6c25---kutewasefufegujugomuvij.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/66223924328.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/77868323800.pdfIn PDF document text
    • http://honda-vo.com/upload/file/rixokununatozapojugixega.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/44614411176.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/palifonopafe.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8bf9c27f---8095539057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=basic+electrical+engineering+practical+book+pdfPDF link annotation
    • 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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 17012 bytes
SHA-256: 2f9cef2fc459f75f230613ce848d73f4c07f05acd488365806b02917eae0f021
font_01_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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