Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b9ebdff95fb626…

MALICIOUS

PDF

76.4 KB Created: 2021-06-28 09:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b60776529dc4a99cd6590cacffbde0a2 SHA-1: cf659d9693aea7e2191d1a47d516f7398c618543 SHA-256: b0b9ebdff95fb62675c4f97995af975012cb1daeaddf501da525500806afc93a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94a195edaa---15059142384.pdf
    • https://paklya.su/design/img/upload/file/nusixeti.pdf
    • http://colorfusion.us/admin/images/file/56958587815.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160839e8b69f2c---risuramojixapi.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s9l3vkkgqg2qljmgh0e0jste62/zevamadiku.pdf
    • http://technoauto.jp/js/upload/files/safobopufatebelu.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ccd3dd74f1---gimufepuzoxejilo.pdf
    • http://brandnewgoods.net/userfiles/file/21010535056.pdf
    • https://trunglamdecor.com/uploads/userfiles/file/gafitimazezenoxabupejeno.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606da04f548ab---44713318939.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a838410d1---70312458390.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/tixuliniril.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607184cf6dc5d---rofezunulexad.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d1133a82---xoreresuvujajokimiki.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bljerennb9sk2c8048mhipkq34/50499550379.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae50ccdb6b---21606975832.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607793b0f16ca---26187447266.pdf
    • http://fouladsazanco.com/Upload/file/63714997947.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3af8032d126a4a00ed18d2c78c04b3e4/11930858662.pdf
    • http://ristoranteibucanieri.it/userfiles/files/7566420798.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c209e9e76---3199226780.pdf
    • http://wooshin.kr/uploaded/file/132865911060b3bd9505b47.pdf
    • http://lamachine.nl/userfiles/file/8941736818.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5363531037---sefixabagojukefunizu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=atomic+and+nuclear+physics+by+ghoshal+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_off0000c1c0.bin
a523e14b3bb6bcb19d454ccae9c931a1d6da2acd321cf16d2d0285d94cf2c836
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C0 18540 bytes
font_01_sfnt_off0000f1d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 16792 bytes
font_02_sfnt_off000109f0.bin
9ba3f41bad622c4a7343eca51187085064e37815b13326bba35ddcd66a0511a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 11404 bytes