Malicious PDF — malware analysis report

Static analysis result for SHA-256 739647329b0cdeea…

MALICIOUS

PDF

54.5 KB Created: 2021-05-24 05:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d83be05007899414d81a7c3cd41cc2f0 SHA-1: 015f3dc62c989fb9b61b01f388007120c16adb65 SHA-256: 739647329b0cdeea8db78c0d51b0d04dc51e8f00531f2b4184736f0c5715d7aa
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of SEO-manipulated terms in the document body and URLs further supports a phishing or malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8187

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 http://ajtoablakcentrum.com/_user/file/71310029621.pdf
    • http://flatadministration.com/uploades/fckeditorfile/pelofunozusofugaw.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/jojugiwevop.pdf
    • https://akproauto.com/nbloom/fckuploads/file/dizatirubap.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160767a473ffb5---12649772584.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/f18fb2ddd55e1657a16545b91b8f6f81/46075630975.pdf
    • https://alakharia.com/public_html/userfiles/file/zezenozixodumabaxatawifom.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a62121092e4---88548473890.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/66e1cd239427827d4ad6ce3ab5e91ffd/jelowemogekisidivajopejuv.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6b0e8f18a361b9c2cd23a7d104d0bbca/kexewewaladas.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/720d7fd80626ff8792387bcab3b5af80/palibo.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8b078832---74368008583.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/863664638e2009cae67b1884a609e94f/4162767121.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/92425d9963e28f6ab17378a992268b4a/jetedivaripomidoxa.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb16496827---ruvigemufuz.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a382f474491---xabitexijofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=afrikaanse+musiek+s+gratis+aflaai+mp3
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd61.bin
13116f5299beb9e28cc3da12062a8054256d350f29ece83adddcb95edcdf81d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD61 5212 bytes

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