Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2eb2c5a39706f03…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 17:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4edb5a73ac61aef0be979b1c790c9361 SHA-1: c324d4cd8fc80be43c7acb73b5419d069dd28c49 SHA-256: e2eb2c5a39706f03402f6e6c521b1e00f0dc96496c5a5fb5b0a31ea9935ebae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://newsale.linyn.mobi/upload/ckeditor/pages/files/64586491322.pdf In PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210911_9324F4A32BED7CA0.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/62397816149.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/58455195328.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/517512670613731e111391.pdfIn PDF document text
    • https://allianztc.ro/files/file/28508942520.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d85caecb---22190143274.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/kigeweguxitulutike.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/vukiweninutopalowim.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137eec130d8e---vizikezazu.pdfIn PDF document text
    • http://cartopack.be/Images/file/tokafuzivosiloxuzujufib.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/80125921206.pdfIn PDF document text
    • http://freestyler.cz/img/file/2881371506.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/95894562985.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/76659527182.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/xunuvirowemolazezagoduf.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109050009121364.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/mudawewemelogolosojuje.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/tesovujuwidopif.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/41627075549.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/logoj.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/ridemekuku.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0604c381e921e6529e24786a50c866a5/82506100416.pdfIn PDF document text
    • http://freeski.hu/freeski/file/16399839255.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/19288598588.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/domuzebejatirokewaparule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=nintendogs+chihuahua+and+friends+romPDF 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_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 19116 bytes
SHA-256: 07434e963c091ddf8c1fdf32e5f28c8587455579538e4819bb11a32c5461d932
font_01_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 10956 bytes
SHA-256: f2e04ce0584c3ef69cbfba6419081f9ab68ee3fe91cc48cad72767dbb28a2c1b
font_02_sfnt_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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