Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7bc4d1948f4e16…

MALICIOUS

PDF

69.3 KB Created: 2021-09-04 21:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e7caee03067b942a467f9240ecd84da SHA-1: 70eb04391599a0d6274c802615e715a304719b91 SHA-256: bc7bc4d1948f4e16b9bc42882205c025b9d106f45cd43653d9efe3840685fcb6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download of a second-stage payload or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=how+to+merge+pdfs+in+bluebeam PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086bafcd0143---8515813261.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/69412278992.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987d82d7a4e---73535139298.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/81141478805.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/dajipejisu.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090212471999.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc5d86d20---xuvemexidajol.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6dd95cdb---70036918114.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/pekuzugulutaw.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b52de56db---vosuxovusox.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/68881057246.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/54379245633.pdfIn PDF document text
    • http://computerdoki.hu/user/file/kepezuzabela.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/27553397622.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3bb262356ae8341083a7148a33588f17/gufurobabosif.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/74622145435.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/vaputado.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610a0a7b65b96---51521519423.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ohpg4anm4r4f7vadmp2c1041c9/nuvujozopugakeki.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29077267641.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/55b8e66688680bda938da0601a040c68/renubedogi.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/91778d29620ee8a206497dc435a9728e/65124304273.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/zubogewo.pdfIn PDF document text
    • 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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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