Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfff44e6dbc81df…

MALICIOUS

PDF

69.2 KB Created: 2021-08-03 09:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a32a9e50f02d0533d1058f85dcd2766d SHA-1: 0638216d9eec06f90bdce203cc1084f6ae9ab632 SHA-256: 6cfff44e6dbc81df5e8f7ac9e91b6407dd8ac834d61d2aecd6c80e82df75a39e
154 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous external URIs and compromised CMS upload links strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8521

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://marblobath.com/app/webroot/img/files/21542611906.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092784db81e2---gavomakexevaviv.pdfIn PDF document text
    • https://12tiga.com/contents//files/lenafiw.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb586a35d---safomogagaxipebuwikomexi.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/bitotodozek.pdfIn PDF document text
    • http://huntland.hu/upload/file/bumuxepuvozixazajowaku.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/39439299163.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f859194573210a831e354aaa16526f9/79691416930.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/82782282600.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e448805abebbd53befd003620c19e89b/bularegunujewojupa.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608141999a8c3---98113571973.pdfIn PDF document text
    • http://wenxuezj.com/images/File/51927410477.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7300e8bed92f5f34627c0addf8e58870/38028138210.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608611f313556---63621013770.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7bdd4bd9---povufetuvo.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/20134661884.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/af4ea18c75ebf89f14482f6cf13098d6/kowebokunexavawutamupapu.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/zunemubakuzekixixiweno.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/59600022204.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/836819dc3f06cdb10665420b2c9f918b/duvekanafokidi.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/99027337092.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/pibumipovus.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fe3d0ded65c7c4d25254d93427f40bc6/6674465265.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/dd220cd9c4fee438328aacf62b80ad29/93388209363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+you+set+up+voicemail+on+iphone+xPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792702ddda4---vakog.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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 11136 bytes
SHA-256: 7228a4fb62cdf2d8ad97576503fb66067edabb1a76f815b52069043c948fd2f4