Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd76277bc7356a4…

MALICIOUS

PDF

67.8 KB Created: 2021-09-30 22:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f0b872ebd6c87b20fbaf56f00e7634cf SHA-1: 14adddad213d6ab4fdcb618c73726bee3e2d0670 SHA-256: 9fd76277bc7356a47ecc2b766863ffcf4ff537aed0490deff9361b6aef5586ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://studioingtassinari.eu/userfiles/files/99907297497.pdf In PDF document text
    • http://wajl.net/img/file/2021915172020.pdfIn PDF document text
    • http://baoveantam.org/upload/files/28980699885.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/munomofifafilagovuporuro.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e01871430---tovadakavezafa.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/kulakotogera.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/40060923519.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613edda02da8f---voxem.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/sabirutere.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/tofibakiwuxeraraw.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/99670982787.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/40247723232.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130ef52c491f---nadidusurawivokunik.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/99992029668.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/zukusepewetowob.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16148b63608180---10272217396.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/gopabaduloxedoxojag.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a99d6e5d1---rovatozoda.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/xasuvude.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/lelazezatuketoxamulawus.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090710155780554.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/diripame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=video+call+from+iphone+to+android+phonePDF 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_off0000adac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAC 14324 bytes
SHA-256: 845f779954a4f9958e87b09314f2bb4c5fb35c3b411a272e5045380de810856f
font_01_sfnt_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 10684 bytes
SHA-256: 8a2c0b7be88c81b6fd6e73af889c3a3bf13ef6c6920dd34bfc1208c1dcfcd434

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