Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7dcdcd0bc92f14…

MALICIOUS

PDF

134.5 KB Created: 2021-09-02 18:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9408247de4eaea0dc0a87106ec493ece SHA-1: f3547a48b809b87b2df8cf9a5872750d3bc54d5b SHA-256: 4b7dcdcd0bc92f1455568212330627eb5ae3ba7a4b14760e1b123d53d0f8dcf4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5665

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://narimasu-chintai.net/jcfiles/file/45405716992.pdf In PDF document text
    • http://www.mostex.sk/files/articles/file/81592684513.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/91788106233.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/najuwovabaxafux.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/46390268660.pdfIn PDF document text
    • http://whatdwellswithin.com/file/tofodimunolazizolubefotu.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/fewokujulapewivufiju.pdfIn PDF document text
    • http://davcpundri.com/css/file/27487698292.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f9e224cb6a9af0fb0eb860f619220692/21329365273.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/38697ce2f0c03c16ec4368f0a2b8a250/lajiririvoruxet.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b4cc9c87---nekilutov.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/76492657798.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/19420242721.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a192427514b---fetuzupodebaje.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/zijidawaxajeguwabox.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/l4f6lr3jbbshjfcnpokaittvk3/rovikafewurile.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac66e2f6c2---56376325837.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f50c978c2---furigala.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/91057018125.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaef48e1f0b---rubenuzeburoxejaj.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/voxosova.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ji7ifq2btr0torj8e83l71uhu7/55702472859.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/95230235869.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2b34f4c00119b754596522c06648b337/82091591051.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/varapajixikubonipegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lord+shiva+history+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_off0001ca46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E258 23760 bytes
SHA-256: 8a1ad8ef14180a6da5f9b5a5e37b02378c19639c27f6b4d679d6f12ecbefce61