Malicious PDF — malware analysis report

Static analysis result for SHA-256 3120f4d2a0f7f077…

MALICIOUS

PDF

95.5 KB Created: 2021-06-27 00:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0db984aefec5d2f75b1ea7171b6f8633 SHA-1: 67174a140616ed6d587895a92f4203dc116665cb SHA-256: 3120f4d2a0f7f077ef259a76883a849c55e38589de808537846011e3cfd4a6e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristics indicate that the PDF hosts a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://stressmanagement-karriere.de/userfiles/file/87939578253.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qbe1nslqq0etkh476uuujq0fq4/12141266744.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/92188499530.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebdf7cbd76---76677805166.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076166629c03---jobililapezifas.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/51672f59ce9a9b2b13f79ab7e70cb311/zevetilowudu.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0496c8a4cb---latisudejefaxofu.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e2f4b720a3a64812f77929113f1be221/sudolakabolixemulajumev.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/24c7c4fc8d0ed53a69c2fbd34a8c3498/negufova.pdf
    • http://barudan.hk/UploadFile/file/20210531100134840.pdf
    • http://ainut.fi/userfiles/file/55843226428.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3280ba9fd---fakidok.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160942e2b289ab---59381882070.pdf
    • http://absolutelyneon.com/userfiles/file/fugunami.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbc82c56c---87174254216.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24669a6f7c---zewelukogalif.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/36194795582.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a695a1f3aa6---reresiban.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jp2o5nvmro6lormc535ndue23m/lafafamiporelolegomazikix.pdf
    • https://aartipalette.com/userfiles/file/juripitubivusabuxir.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba1f155f5---59857091574.pdf
    • https://rajatotogroup3.com/contents//files/latojiwuwagejadu.pdf
    • https://panama4d.com/contents//files/99868712374.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0a74179c3b1ab1bdc7b030c333ef53cc/vukimuloja.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a0103714f8a---ratebubeje.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9hma4486sgpdqejb6h656l1v73/boxor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+marvel+movies+in+order+from+first+to+last
    • 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_off00010f9e.bin
21f8fc83f28c0fde2f3b51525f3fe89a3a6a90a1b7e25367527c65ffd75e4b71
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 10648 bytes
font_01_sfnt_off000127cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 16792 bytes
font_02_sfnt_off00013fde.bin
f23be6f7ce87ac0d2de8c1c96ba47de35297dbc9a188e43f321bf8081e0181a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDE 17736 bytes