Malicious PDF — malware analysis report

Static analysis result for SHA-256 d422e5248f063c06…

MALICIOUS

PDF

85.0 KB Created: 2021-08-23 16:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87af2fab19586217e0e065897e89016e SHA-1: 2c8a27d1dba24b8cefee0e3f49c6ffc5bd60f58a SHA-256: d422e5248f063c065d111c7cb221726ce6979cc8c86da01cee155cfdcc2e7756
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, possibly to download further payloads or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://reutlinger.pl/userfiles/file/tixexusipugil.pdf
    • http://movementlab.dk/userfiles/file/noporedulozikuwufa.pdf
    • https://o-dance.com/upload/files/26705259260.pdf
    • http://unsersohn.com/images/file/34222827962.pdf
    • https://riolospettacoli.it/filesUploads/file/tuxelasetesomuz.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e28b39b94---33005784729.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/7953241638.pdf
    • https://abrasco.org.br/ckfinder/userfiles/files/48569520650.pdf
    • http://marketypik.pl/zdjecia/fck/file/83059729554.pdf
    • http://chpcentre.com/files/file/33030769687.pdf
    • http://hilimall.ae/uploads/files/36532694954.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b357c19b300---putibumokazuv.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609599d0464d7---29284644475.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c37ca6bb---zarininepitumefifexaja.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/wogudorevoxux.pdf
    • https://airbays.com/userfiles/file/lojulole.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zetaxemiselaxogofote.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/u7ud43hrofh6rqn8at16amlmpg/7750680520.pdf
    • http://studiocalcinoni.com/userfiles/files/35151112448.pdf
    • http://mazdooradda.com/userfiles/file/9718286608.pdf
    • http://medica-eg.com/userfiles/file/46215740458.pdf
    • http://architettosbaffo.com/userfiles/files/28600391746.pdf
    • http://metallpress.ru/files/zeraxabatefuzipudusepeb.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/63a91ec7dbdd63d57fd3a017ea165119/14491878008.pdf
    • http://yourbuilding.ru/userfiles/files/kudetanirewupeki.pdf
    • http://brezov-gaj.si/uporabnik/file/sivumov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=add+video+link+to+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea95.bin
ca17b6e76e4b93687f1c3a2fbcefc0ff307eced614be4181adfe3c7125bd853d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 10200 bytes
font_01_sfnt_off00010185.bin
a1ffcebaf698c2c3877999822eddc4e1afef25dfbadbd9c941e3af3ac86aab7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 16956 bytes
font_02_sfnt_off00012dd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 16792 bytes