Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4451ddeeace082…

MALICIOUS

PDF

63.5 KB Created: 2021-09-26 06:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6dd2e2cb08869a0f0ffcefa11e424479 SHA-1: 1bb310dbc616618ada0ef6dee778c28e19b212c7 SHA-256: fd4451ddeeace08258fd59ec660909ad0890593d6ced18bf279c6431d182f2ca
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of directing users to external resources. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=how+to+open+phone+lock+without+password PDF link annotation
    • https://ljlconst.com/admin/images/file/rovevezizeparino.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/detilokizenubovevof.pdfIn PDF document text
    • https://aildf.in/userfiles/file/8428084661.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4ivog5e5d9eofbp895dhrfl0b3/35968115655.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/judovujakizikaxagujebu.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/68363911406.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/giweka.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161315b07077ca---57299415274.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/tibomogu.pdfIn PDF document text
    • http://lactopad.com/uploads/files/ledalufumadapi.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/nosemanab.pdfIn PDF document text
    • http://yepuco.com/uploads/files/powobaxavoki.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/fajewu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9c7845ca1b705443809ac07854551d13/jotegedilusopazafob.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/sigarupujomobipuzenexifu.pdfIn PDF document text
    • http://mobiliteit.nu/files/mifuvupuratobumujidub.pdfIn PDF document text
    • http://garderoba.sk/images/_file/96880161065.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/vugovug.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/gazalebegufowato.pdfIn PDF document text
    • https://equinox-e.com/upload/files/ripupi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7acc49736---53201423791.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/189763c0c20f56dfad44d9af0720387f/46797551490.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/takugusitasokugifot.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/53245986519.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/26300478770.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/rupuwutagazal.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_off0000b310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB310 16432 bytes
SHA-256: 6b2e7c1df9493908bf0e56d86bcc0af34d8451b1fdbdb0faca1dab4647f0017f
font_01_sfnt_off0000dccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 10880 bytes
SHA-256: 16933b69c5c691e6d1231296bdd148759d89db6155b425d79324172690ed4789