Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75d4b747c0993ad…

MALICIOUS

PDF

68.8 KB Created: 2021-09-10 14:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8d7a166e451714bf7f85fb3ff971cd9 SHA-1: b7e74aa9526bb03d1b3fbe7b5ace2cc039167b3e SHA-256: d75d4b747c0993ad7f712a87ca360b1d3d0f0f7590b891abe950fc1491f412d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and content suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://chcial.ru/uplcv?utm_term=how+to+video+your+screen+android PDF link annotation
    • http://delve-cr.com/uploads/69048327658.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/jolixovugutesose.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210907112654.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/34929335083.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/zulufukadesaratosodo.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/51487832087.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/96215504712.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/wezoseragitezulutakilabu.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/81719721228.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/babiguvagiz.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161362fb7aaba0---90448268446.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/dozazavezuxalimexel.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210903_075033.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6cbd4441afec4f0d4ac928cf1e7f236c/dirofer.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/06d7k1ks0ebm6l7i7e1h5beiv9/13769648599.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/67474474568.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/woxelaveravuwur.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/tejanigixapiwusiwen.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16134c41d50076---logezele.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/vowupedulekaxapol.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/24622520323.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_off0000b181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 14284 bytes
SHA-256: 45f9e82c36281fddb0a3acf67b7e0d90a8bb166daf922b84374d646e8a8255da
font_02_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 10672 bytes
SHA-256: 4596e67f1f2f8df2e9a9339fafe6840ced8a8b05f7fdf7af62a96b60d87f3527