Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed25ecee62077e59…

MALICIOUS

PDF

74.6 KB Created: 2021-09-12 08:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0aa02f2dbc5994070082e2d35f9ca417 SHA-1: d0f90653608fc5d5bd8ba6d5f50f107a2a447a48 SHA-256: ed25ecee62077e59308447da357c227146c682d43ee350122a5c77e31a558088
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of 'utm_term' in one URL suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=u+torrentz2+apk PDF link annotation
    • https://rawoctane.com/uploads/file/ginafuwukitejefo.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/kinunibaseji.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/63027792107.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/wewafir.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7fb45db0b---61822426084.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/wefiwitutiga.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/vukaroj.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/gadurulugorutukuwepu.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/siladilugab.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/rukidir.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/71878066753.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c38b41dd59---pidusemilufuruka.pdfIn PDF document text
    • https://comfort8889.com/upload/files/xubujonofurorikaf.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/dejep.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/45216776983.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/23623751998.pdfIn PDF document text
    • http://mariancozma.com/_user/file/23994373794.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/25248592764.pdfIn PDF document text
    • https://gangnampools.com/contents/files/89183576296.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/26616060134.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba72cbae2---zotosuriv.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/nesonureresam.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/vumasularojuze.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/3025478658.pdfIn PDF document text
    • http://juentai.com/userfiles/files/36179835141.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/90377209640.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/moropa.pdfIn PDF document text
    • 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_off0000c3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F6 16356 bytes
SHA-256: 7654b9e95e4a0815a8c859978d0c4e2b8bafdc1d2b60ee14624daa3df6f1e3db
font_01_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 10216 bytes
SHA-256: 4a46a7b48fad352842e0abaa5ddab4cd9bccf9d40af398f62d86d576a0f530c8