Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cab732e2230dc9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 01:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5da523f18510e4050a1016285a3016a SHA-1: e49250e67ef0124ec148503cb7958043e248a49e SHA-256: 59cab732e2230dc9381b2dc83bfe155b0460188a4bf29ff30154f4a805343a03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The embedded JavaScript is a common technique for executing malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613add25a0e20---jipatavobudunufekowufexuv.pdf In PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090716362973499.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/gorivowitunixe.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613244cdd6346---rozarasanotalamuritemos.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/dejiputi.pdfIn PDF document text
    • https://yifff.se/userfiles/file/galefukaxija.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b3eea820---labogajutabelefuru.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/adc99c5ce97224d939995faa488c53e7/79551799496.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/25445433656.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/19112638288.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/vodalodal.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/408482192.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/gobotamaxezu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/99941814007.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/1092083101.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/72525196785.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613b89664117b---pozoje.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/98649385411.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/paxotuzor.pdfIn PDF document text
    • http://identik.hu/editor_up/xalugibivamebowip.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/6057994953.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/85256858721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gameboy+advance+pokemon+games+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 11104 bytes
SHA-256: 28f2622ee49bce234a616a5ad0f38d1b50bfc56dc8e7341ec6bf9aafcda652d6
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 17888 bytes
SHA-256: 4d7d37ae67739f5dd06c37f8a614feb318c1089387dcf91eed31811d3849f45f
font_02_sfnt_off000123a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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