Malicious PDF — malware analysis report

Static analysis result for SHA-256 17408b4f67b1c026…

MALICIOUS

PDF

79.5 KB Created: 2021-10-12 02:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 209b225a20f2db5636a43d03b37ce984 SHA-1: 254d8bcd11f97560f561c38e365fd5ec710241cd SHA-256: 17408b4f67b1c0263727b09ea4e39f7ecf3a0ec87621fb77632ccd01c7736cba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/db0eb936fce0ac044ff0a8eb50087af3/jamol.pdf
    • http://mobydick-band.de/fckdata/file/vefukiforodenunos.pdf
    • http://annamsaigonlaw.com/upload/files/rebakuneromudodilegame.pdf
    • http://vetusmeter.com/images/upload/File/mudijumazur.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4f42f96109454fb69d1eb55989e6e829/56154521465.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83611289353.pdf
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/fuvozumapuwexobemitesilud.pdf
    • http://tahi.hu/ckfinder/userfiles/files/dunesolibo.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/36438914254.pdf
    • http://valdhans.cz/userfiles/file/31770646488.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/55404566096.pdf
    • https://morganmethod.com/ci/userfiles/files/lavopadapudavu.pdf
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/lawogorodolofiwaz.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/mezazolejujig.pdf
    • http://sevvalturizm.com/rsm/files/porisoju.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1615ead7b3329e---42860267236.pdf
    • http://bosch-elektronarzedzia.pl/catalog/file/fejodusetepowomux.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/30231011530.pdf
    • http://mosjob.ru/images/file/kibigaleduxiwaxedelis.pdf
    • https://doxity.ro/ckfinder/userfiles/files/41125409175.pdf
    • http://bright-mineral.com/uploadfile/file/2021091904151752.pdf
    • https://ph2020.org/FCKeditor/file/dorokawopusipatisafa.pdf
    • http://bassonconsulting.mc/userfiles/file/rerewozomag.pdf
    • http://letdentalab.com/img/files/46869563395.pdf
    • https://sssmri.com/ckfinder/userfiles/files/vapuwabe.pdf
    • http://pepinieres-soupe.com/userfiles/file/xekupudagulegudago.pdf
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=pubg+mobile+hack+apk+download+android+2019
    • 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_off0000cf4c.bin
b5120ac0a2479597b5f18f7e21de5c39dd86b57cb2efe9c0c289974bb71c3613
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 17600 bytes
font_01_sfnt_off0000fcba.bin
f20f9242c7822f68aeed0974a8085bb7439479ba197d1f4bb5910053839deb38
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 11576 bytes
font_02_sfnt_off000117ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 16792 bytes