Malicious PDF — malware analysis report

Static analysis result for SHA-256 230096018cf1af6a…

MALICIOUS

PDF

90.1 KB Created: 2021-09-15 00:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c89291c529d3951cb3f5fdaaa9f2efa2 SHA-1: 5c34d6ded90fdae6c5a90c21f3d4c1775d8b61ea SHA-256: 230096018cf1af6ae2ddfb653e20355a2a3f0371777d2a47053b3d6c8082938b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing by directing users to potentially harmful sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://dentalweek.eu/userfiles/files/37612868502.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161356040774b2---dawowa.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4fglak7j57kgu1kft27cq41q3o/koxuse.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161410d796649f---54503795905.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/89581659113.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/38298527714.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/94227145309.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/favarufudodijamisisepaja.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/pikibitafovinafujiwibefi.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/36151274803.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/11803788719.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/68888992080.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/sudiwijunagopop.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/temenoj.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/84719339132.pdfIn PDF document text
    • https://vitanov.rs/files/53433754293.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/72517140872.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jevulezodoxuzunosogizuju.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410f47bfc50---rofemabisu.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/82621185956.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9731417c0b1022e044ed87a3ce0f4e32/33920116213.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/22716459821.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ninewusewetakiwutit.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/2601398150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+android+pcPDF 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_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 19448 bytes
SHA-256: b07d30e412d305178d966c383f35b248f3f593229e0fa457456b22e5f450c05a
font_02_sfnt_off000142e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E2 10516 bytes
SHA-256: 5ac007c402cf19e912cf93f6667ddf816ebb1426cec410bdfb221514e4ba075a