Malicious PDF — malware analysis report

Static analysis result for SHA-256 49db88c8433756dc…

MALICIOUS

PDF

88.5 KB Created: 2021-09-05 22:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8aa01e851e01f92af4de0fca41b204b1 SHA-1: 1d4e8cef67cc2aa12412150d2a69f162f9ad2298 SHA-256: 49db88c8433756dcfe87706697bbbc0f3fbee58c8abfb65c740ad31f63dc7e70
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a894c41db---morudolibegenekituruza.pdf In PDF document text
    • https://acrgroup.nl/userfiles/file/xupigoje.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/jutilakibafo.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/jujorine.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/23144355219.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/93226050923.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/famup.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/24219333802.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/fulofakijupenonifedegamox.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6891d6d88---61001930886.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/zosudowurena.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/83284647637.pdfIn PDF document text
    • http://recrute.fr/files/files/salilu.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/23675193227.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/23862821745.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/84593219908.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/tederifopemopej.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b17a241f---96005159289.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/22928056816.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/57adc92958d224a31f60a77bb1c5a27e/rubovotafitadigifevekuvi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083fcf55536d---jiruritijib.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/au0doa5jkia56lgoao6rigcu84/wijugusakofutaleziw.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/82080764048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=telecharger+convertir+pdf+en+word+gratuit+fran%C3%A7aisPDF 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_off0000ed2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 11312 bytes
SHA-256: 5f154fc6c685e45eb17e067f4493f4e3d9ac3d7abec3f581e6cd89d20fe8c634
font_01_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 19944 bytes
SHA-256: 06816df0ae19e6c1725589d449c1581936d86eaf1cbe6a059b679d777e848f76
font_02_sfnt_off00013963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1