Malicious PDF — malware analysis report

Static analysis result for SHA-256 684253524e474945…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 05:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9d48098a5ddb3f2e3081eba15225bf5 SHA-1: b524de611af74acf4ef387b2d07d75857dba5ac2 SHA-256: 684253524e47494516139fb2e81cb8efa77f04920ec221b1511626aa57ac12a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through a link farm. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://telechips.com/ckfinder/userfiles/files/rowuwafekerazejasar.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/4831620025.pdf
    • http://citra.cl/userfiles/file/sewawepafa.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f556e09596---72314132968.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a158a5e99bc04e8552c7252b28a47317/jugipalafipodorulaniwopov.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/995b7b93adec8216e74f5b34e362a4de/zilofu.pdf
    • http://absolutelyneon.com/userfiles/file/231255482.pdf
    • http://cpghollywood.com/userfiles/files/532130239.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072648b5169d---vinatesomo.pdf
    • http://twilaw.com/files/files/damazujopipumedarafumi.pdf
    • http://bradzo-ep.com/uploads/files/gobugapoti.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/np685358p14ot99kuuhl5e6ek3/mavitanojekuge.pdf
    • http://gidaero.com/upload/fckeditor/file/93393339405.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4119e16ce8---pomijogamugogumij.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a016b6a098---13331242159.pdf
    • http://vinmexindia.com/uploads/mumewokukago.pdf
    • http://trustarshida.co/cache/fck_files/file/59252457385.pdf
    • http://ahkjt.com/upfile/file/xevekotazizemisopizoxir.pdf
    • http://esoftland.com/userfiles/file/12767863175.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/85c8897c6efefff892a1d3f6a721b1e8/73853644913.pdf
    • http://superpart.com/files/33216498080.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/aae5f0edd30dd93d06ec68ec75024614/25123435108.pdf
    • http://guitarenko.fr/img/files/58189948560.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16110a6c9a1c74---selimiwumawerusa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=four+letter+word+third+letter+o
    • 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_off0000ddeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 16792 bytes
font_01_sfnt_off0000f5fd.bin
28b94e807e637973f5f10e63cc250febf370bedcf2ba82de68062e026df06daf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 18168 bytes
font_02_sfnt_off0001257c.bin
3529778396176fd98ffb7ffa8f7a0170ca7b3d7e046fb013a4600a5c4f5ce6df
pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 10072 bytes