Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8ed9c73dd750c4…

MALICIOUS

PDF

71.0 KB Created: 2021-08-30 08:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5372fdaca39221347b9c840386d6ac24 SHA-1: c973c3ebbd80b2da88740b0e5269f0049fe2dafd SHA-256: cf8ed9c73dd750c433027d049e2bdfecf59576d0468d1115e40daa2e442f64b1
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8991

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://philabc.ru/uplcv?utm_term=catmouse+apk+for+android+phone PDF link annotation
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/niuefd4l3f05910ldmlf3o5seq/zelisa.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/toxevarenewu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848788f0211---golanepajivu.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/regisorunulu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea741bdacb---36999101288.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/29045910533.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/fakazati.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/kivasemidimitegejebexi.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ribikerakedi.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/23086454272.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c76f28e140ffe44f22e7f205d395996a/luwido.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e7aeb8459c98f64144f97d1da7ae41e4/9588942911.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/xesarojegakomezinuzokoner.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d184d6358b6---mibesogubilexijididiro.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/labedovi.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/33135780605.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160879c2b24466---3383621851.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606defbece24f---tejitufexeten.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a44f80748---1211013500.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161207b3ea1eea---34240206320.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2405800b015bc29fa7229ddafebf67a5/37199573357.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6ac85245d02a4c13c587ad8607ff0c48/64679514779.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160900f8069340---55590879436.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ae958bfe---5694655672.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/290k2fstv4rp55h3pcbq1ikse5/51576463626.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_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1