Malicious PDF — malware analysis report

Static analysis result for SHA-256 b965da75b4cb8562…

MALICIOUS

PDF

86.3 KB Created: 2021-09-11 21:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4880d3b748c9e1e6eab4311f3f36a834 SHA-1: 0b99c9f38ebe6d0c2a4fb26580ba6d65bec0e1e7 SHA-256: b965da75b4cb8562674afd98c5d4fba235c6830fa8bb2fd5c83f84c2be015632
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as legitimate files. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=tubemate+apk+old+version+free+download
    • http://cuanhomkinhtoanthang.com/media/file/nozudujokisez.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/wuxazizig.pdf
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/diramim.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161389bd1cf03d---mabekizu.pdf
    • http://lungshingcentre.com/userfiles/97457429764.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161377fa2f1c66---mafijimapa.pdf
    • https://vnnc.vn/img-hdmedia/files/22399172897.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139852b05f07---wejabujife.pdf
    • http://vngo-cc.vn/cooker/public/files/kobesodebuwopegonaku.pdf
    • https://jeevadhara.org/work/london/userfiles/file/sejafivufefirigebakuzini.pdf
    • https://zlato-stribro-investice.com/upload/files/40710578047.pdf
    • https://tradingphrases.com/userfiles/files/86659104011.pdf
    • http://thy-environment.com/userfiles/files/tuxobefirij.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd7c11111---77284571550.pdf
    • http://to-kajihan.net/js/upload/files/67313652322.pdf
    • https://foodphotoshop.com/userfiles/files/gerokibepesanowazezet.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/depaderoruwomasozarukoj.pdf
    • http://cerrutistudio.eu/userfiles/files/gikezivo.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8td4tubd7olpvtn08d2cphonq5/rawibijawuzubelumig.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/silelefafusunanomukus.pdf
    • http://aimic.com/userfiles/file/55344954022.pdf
    • http://studiodebiaggi.eu/userfiles/files/marivev.pdf
    • https://naucharts.com/ckfinder/userfiles/files/wusomubuxuzilavozosen.pdf
    • https://artesapanaderia.xyz/aym_image/files/91080888731.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f065744460---nuwuponipojofagizire.pdf
    • http://dejede.com/userfiles/file/91178421596.pdf
    • https://baatco.com/ckfinder/userfiles/files/fafuv.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_off0000e741.bin
a6b3b051a1d1ce312411eadee1d1defcd1e89128f23d9da7b7c330b546910116		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 11104 bytes
font_01_sfnt_off000100f4.bin
c2ada4f7ffa4a4e9c9e473964d3cf6efceaf71c48e85414f7c04944cf966d3ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 19208 bytes
font_02_sfnt_off000132aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132AA 16792 bytes

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