Malicious PDF — malware analysis report

Static analysis result for SHA-256 822708e84f345c26…

MALICIOUS

PDF

115.1 KB Created: 2021-08-09 14:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 969595de565c1d79d88b830c50fab0c1 SHA-1: 64e03e466c8dbeb5dc34feeb31d2723b14fb8c7b SHA-256: 822708e84f345c26edb67607911e46a7c48097ad841f72a7c1daa581b7037bd6
132 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4014

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=livros+de+daniel+hernandes+dias+lopes+pdf+baixar+gr%C3%A1tis PDF link annotation
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/i22u7n28403d1aebo4dkg4iol3/naluj.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/sedidovubabumanil.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/nidebowemewibenogobuvo.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/86682469738.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gumibotoridafatesukibu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/533fcl4a1139ebg3eo40q3tu8a/65110363457.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/kigusununofew.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdlh9balej3rk56sepqvtsvbp5/nikorifuzatetivibupim.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/76233975062.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1625834506.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905e95934ac---sogabatibasedi.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/tv7gnd42fbq8qa1amu2qe8h07o/latutunimasagu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608491e8099b1---surijafix.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c65b661f688---xekerevo.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/78871017196.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750fa9c8a50---demozozirixuwojopef.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fabe1ce1e---supikibof.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35d471871---94258652123.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/sikokipo.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/wukumiwijedolixalu.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/jibtqnun3lmn3sqpnd9erevv0q/81130803820.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b76aaf8659b---luvofiwelojafoni.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842b6a12012---94652125597.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/xenumivufojudovudobaw.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_off00017c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19479 11220 bytes
SHA-256: 4c69efb7a22fb99fd6b7c36ea358dafd2f1d0840417b7a1bf7a0699f133f5e3c