Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad33ccc1f23fa5f…

MALICIOUS

PDF

77.7 KB Created: 2021-06-05 23:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2a4a3fa57bd40d31313410d49ddb8aaf SHA-1: e475058106c510fa3965df0938296a23c4fa8651 SHA-256: cad33ccc1f23fa5fbed573503461c656ab71dc369eafd5ab520ac0dada020f07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm hosted on multiple compromised websites, including WordPress installations. The primary URL, 'https://queure.ru/uplcv?utm_term=dls+19+hack+profile+data+download', suggests a lure for downloading sensitive data. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8117

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://queure.ru/uplcv?utm_term=dls+19+hack+profile+data+download PDF link annotation
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3ff4g2bu1hptnq9abefts1vhi4/kelolo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43566b3c2f---48818516547.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/libuwujobagetag.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5d18ae16c---91734021127.pdfIn PDF document text
    • http://fotossc.pl/_files/file/jarilixumite.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94dcda0813---xebiwesoxoguborawavoge.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160961582946b1---60853325141.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d653b4caff---lakijelilekuv.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5b9999a4bd1f214eaca8f448b9bb718f/butuvukulojunat.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082472f82b1d---lutigakupuvokaxejupik.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/1286957474.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/93208b0a79820fd0813b6f5aabafa40f/36359443398.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ec80embcs706rakdqdt180f053/10224263454.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/98a587c836269a4e13558be1026538b1/95620271233.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/f05qo1kjp9u8jetpmlqmsruelf/pinepipenubipumivufez.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ailtut3lpcuas8255c4jb8i83d/38880985031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 5604 bytes
SHA-256: 75f9a183a36925423d6ca6f4a01a3128f4c316779b3b6de9bc8f5d9c7a56b292
font_01_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 11188 bytes
SHA-256: 94df760100bdccd2b136d00d5a250960b9a9cdad8fb0d4bbd2ada48a9163a31f

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