Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8400cc60b8083c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-07 00:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 926f50d39a3c15f652b36cc0cb91370d SHA-1: 22417338dd6c310c98595b503ad4783baca3fc47 SHA-256: cf8400cc60b8083c581af0c4fb570f4fb7a71d9171f4d6831055f09e8f08363b
154 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5249

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=types+of+inheritance+in+oops+with+example+pdf PDF link annotation
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ggimeb4tqaqcont3sr7ru4l3ol/42914067258.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/dapexilusinavas.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/29bbdafc2dbc4e36a1b3b3c66b87aa4c/41444170578.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/54660738679.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6063df296---pozodewu.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/mudinivuvijogixigoxirit.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9f91ab5fdde44c1c50bb14ff900ed343/13118197106.pdfIn PDF document text
    • https://cncunse.com/d/files/98312365091.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/86863107475.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/86150223903.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/27559a9ecc18af8da918e9a584bcf1ef/18977167402.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fee88362ee---sijanogivuwuv.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109895e30cce---vaxejajixigufit.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/93150039381.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/kexawipofesedabupit.pdfIn PDF document text
    • http://sy-smile.com/upload/files/28199873819.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/v6bc2a60632edhcus3ukujo41d/80757014061.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/43162036552.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1460605221.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/wupuwideke.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/bumasuzugetitelegebi.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/60789968138.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/merebewel.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/tukufegowududat.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dae685ec23579a1315a267ca04d21ad8/50580592346.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q6jvj7juosp3qoqdop0sk8s501/fezokibasifajepuwalara.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_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 11148 bytes
SHA-256: 407f6167055be5afefd62ca8592bebeba4a6d746409d32694faa48992de595cd