Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed82f2a461bc0ea4…

MALICIOUS

PDF

74.6 KB Created: 2021-08-25 01:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 226693a5c508dbbf5e587eef294e535b SHA-1: 4d9985415941d3c2fcb1d4cbf853698cc6c25713 SHA-256: ed82f2a461bc0ea435f6430c6e037e5aced4e77467f5c6a8bffbd59852a9f3ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these compromised sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607228d25e83c---7244019257.pdf In PDF document text
    • http://capmar.eu/userfiles/file/jijanuse.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7006747977.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a594ea82cd83d3e21306fe94dcd69a9b/xuxevowofezitamegu.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/begubavek.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a524ceb9aba394e9300ab970c55b14c0/neriwugusaxake.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae98e154196---87566016075.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/60746515489.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078074835158---vepuxefali.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/93908095596.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zamixol.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/zatikobadisevetiba.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/vurolotarusebefev.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/49ae2673bceb56f46c03b2aa0d4b797d/xazuvozukubo.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/79492610159.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/zamunumowemesu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd4ba782c3---boxalalezaziripawule.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/44699082048.pdfIn PDF document text
    • http://industrialdevices.in/uploads/7892222871.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/6399670914.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3213d5855d---14717982266.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/wuxaveriwofigevigopu.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/32527528724.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/88467662630.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/weliriraworozudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=some+sedimentary+rocks+form+as+the+direct+result+of+thePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23B 15584 bytes
SHA-256: cddd9e4a2a99325e492e7b255eea3a627201c0b45868ef1da93dbb649da34b85
font_01_sfnt_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 11124 bytes
SHA-256: c3b55862ec70bd617de6ffe81b11c0904af7d48853f9f3a0daa065221a226898
font_02_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1