Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c72ce7aa9de048…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 14:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0c1d080d4552a395c76475c9eb28c7c SHA-1: 7f5688ba71702122699016db659053c2db2c7698 SHA-256: b4c72ce7aa9de048799acc2c7eb7092bc9ddc593b8ffd88737461996ceb7cef1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=migrant+refugee+smuggler+savior+pdf', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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://nomylo.ru/uplcv?utm_term=migrant+refugee+smuggler+savior+pdf PDF link annotation
    • http://rudolphi.nu/userfiles/file/tipagidejozesurefama.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48e57a507---pemimetovusapeximitalow.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/43113212876.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021080307125973499.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/denitexa.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f563d65740---xedevajidaxigemosewuk.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/62405578230.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/763f4f64988bb9b53f536b9ac607b376/bureridulekupa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/nk5nvunh7adn1n9kr4ute79s7a/8668692639.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b0085d7e---tamemozoxuz.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/pabepivewirexujaxozex.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/86332580067.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/23388001854.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/92739541026.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/16cfdd75f4b787d03ba10517f517a36d/17898960982.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/mujeken.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/15157622630.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4516b18fde30e55068ec657ea1fbdb15/50202083145.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/777d6cd84af56d274fb71a0c190a18dd/buvagiwexudukakelofozalo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b26fe923ac---27676876616.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/16093a012c53277cf09fffc6ccb0716a/darafuxuxugijudusi.pdfIn PDF document text
    • https://ikansambel.com/contents//files/bosogarafewuvomema.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/52295316755.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_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 18564 bytes
SHA-256: 59d23ea8a353c203a0a674ab8ca37c1d19253ff1cac3a479149491739497f7c9
font_01_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 11000 bytes
SHA-256: 5327dba393da418c90135c5fa1a006b3717ef9ee14e5a942f9a48c0da89ec331

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