Malicious PDF — malware analysis report

Static analysis result for SHA-256 25eb7041193002af…

MALICIOUS

PDF

89.7 KB Created: 2021-08-17 13:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb7f2e89498f85be8295927884be2dfa SHA-1: 4db6c63f7bff53479508a311da7f4555f80636af SHA-256: 25eb7041193002afe16cd52c34be414bc2b5775026e39de04ab19b367abef8a3
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 or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://smidgel.ru/uplcv?utm_term=business+management+full+notes+pdf PDF link annotation
    • https://hse.tw/upload/file/28538605463.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/301627175766.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/tirakirofovisenazegob.pdfIn PDF document text
    • http://digifast.cz/userfiles/xelizagetatemuvexe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2ab3bf81c---5178927542.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/buwuj.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/82206044624.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7ccf073d---jelagenezonenu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608640346a529---xamivaxedutawodube.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3aac6f7ee---75306913300.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/75257369958.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/30274052144.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/25/file/20210625_223239_156.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/wogusubotatagufivivukoki.pdfIn PDF document text
    • https://latework.cz/soubory/sadubepogaxamitonuzil.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/kewepebedaxiligek.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f5651ceac28b133ab1f67d57dda0ffd4/90445861004.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/dixekovofu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcefe427263---14672805327.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/belivosilamaxot.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/bigubifubojoji.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/99445151202.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210503105654055218tttua0.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/994537b3de1b68357bb5a4a1eaffb16e/13635178657.pdfIn PDF document text
    • http://momsystem.ru/public/file/vokuna.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 3676 bytes
SHA-256: 33b2010940ef0634e5fcd1740d74ee24e76b074b79c84044230035d6f687f9a5
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 10892 bytes
SHA-256: aaef1b832f0526c580d94f480d24cfbca54514173c832c58a841e0e964985188
font_02_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 16936 bytes
SHA-256: 57f35c5ff439b54e592efb708024dfd2e7cf5179fb62661fde162e401eb73405
font_03_sfnt_off00013f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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