Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3ab67ea2dc956e…

MALICIOUS

PDF

71.0 KB Created: 2021-08-20 17:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7845a4b31c1e31a0d41a4cbef6a7dc24 SHA-1: 6d7caaa721cb514f5641e41a1e60e622ad981b4b SHA-256: cb3ab67ea2dc956e15c718e5b2fe2e77fe0c043259c531b49ffe7a8c34052a6a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as a malicious phishing trojan by ClamAV. Heuristics indicate it functions as a link farm, directing users to download other PDFs from compromised WordPress sites. The ML classifier also flagged this PDF as malicious with a high probability. No scripts were extracted, but the overall pattern suggests a phishing attempt to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9178

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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ehtjo2h7besv6tudrfra7038c4/mexobebak.pdf In PDF document text
    • http://wawa757.com/uploads/files/zaremezemafegovujar.pdfIn PDF document text
    • https://asi-filter.pl/files/file/mekuvokaxunezazejapo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/d34f0a905bd1a3b4508402a6e4cdd53b/kunebi.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/sotopaxafapagaravebajuti.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070de2edb77b---48828237319.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/991e646f337352712d4c37a46807dcf7/gozimewezig.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7985529f1---pebevasazakapegepiv.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/38483136544.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/mijiv.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lagutatosopadaziriziso.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9145fc7f---32389280898.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f2503333290251294c657d4fed00693/40321080301.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/la7vb3lbmqleeempom9fgdhrj0/38085775575.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/4746620606.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/xetawiwutisomulapudi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/5b4d05546de57f6d1e1c4353400090fe/93140074719.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/fotafazasemapinujumubo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/2476710257.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/fotadopoluxuvekakoxapi.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8e5d9250---vonozuzijosobijevutidiz.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/43344852716.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/66556697437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=descargar+libro+don+quijote+dela+mancha+version+cortaPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/67902632233.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_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 16564 bytes
SHA-256: a46ef6c3a0277f32cdaf1b3852b716c35b6d24d33ec21cafbb9190614129a461