Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27316afe9d9e9ac…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 12:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e76215241b30a6957ba11cb8a03920c0 SHA-1: ab5ac351e53f05a20b030cb283dc5daddc8b8319 SHA-256: d27316afe9d9e9acf51fa145e717d1835e0dc43e88c6ff505a92178326ae1ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous distinct hosts and the use of disposable hosting suggest an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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.
  • 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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878960d1b4c---81880764175.pdf In PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/banumulinaminobovi.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/21406284746.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/7386265829.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/30829499141.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/93698782235.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/38668672984.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/oe0gkq16u6tmrg4vhn1cplsbj0/75579940669.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c53f53e07---41482549419.pdfIn PDF document text
    • http://e-district.org/userfiles/file/lijifitebunuviderurij.pdfIn PDF document text
    • http://ecole.ru/text/images/file/29417792300.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/bajibejakitob.pdfIn PDF document text
    • https://webhosting4.net/media/file/giviluposavivonuxarelu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2ba84dcb0790980461763361dc552b75/zomogiwotuxukukinit.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bf9d8d391---muvur.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae7583d503---miwawuxo.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/47513338151.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/85281158937.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/xipogoroxegifovowu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/co26b6paap5ktgavg17ne3sk53/85962307846.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f70229857f224652e8fad15f2724aacf/13150334753.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/xudosu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d38976efb50896d074edb25906188a94/vomaxevakonam.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160711ca27e856---mejubidofujipom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kelenjar+tiroid+adalah+pdfPDF 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_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 10548 bytes
SHA-256: 4320a225fa34f4f26767671b4841944a33b4f83706e961ef8952a5e0d3d2041e
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 16672 bytes
SHA-256: 72d9c5fcd12c302ab9f04a0b2e4e6966ef18246a1b4b55f5c7f32b68fbe09007
font_02_sfnt_off00012bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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