Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3de5a23bd42598…

MALICIOUS

PDF

87.1 KB Created: 2021-07-14 09:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 72e0eb1f47462d6d80467806b59b7bf1 SHA-1: 12ebe9deccf23cd408fcbe5ae4c3b90331a70ebf SHA-256: bd3de5a23bd425986b7a6f07eb622778cc7e9cc81ef6c17468b4b33b99856234
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The document body is unreadable, but the presence of numerous external links, many pointing to potentially compromised WordPress uploads, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://promador.pl/userfiles/file/selopelijesetarame.pdf In PDF document text
    • http://frezerovka.by/images/fxeditor/file/54244285544.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/63709058036.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b28998e570db024d0bce4a87ed6c6a1c/wixejasol.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/rigupiwuna.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/13028177083.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a12dbd9937a---27772787004.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/91559572690.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4574aa5b1a---dezaj.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/73854773536.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/wefezeravevulofujeranu.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/sefujolisi.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/52149643313.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/59907361996.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1vd5vbtceqh45s6c8nh3rgpsn3/xozisunakiveketa.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/17993576606.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5d00b6ccc---16073358166.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d886f90b6c---16046233255.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/848f5e4b14b1aa876f16493b5c26c95d/gemevozatodav.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/36236158419.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0dadf26d---9901223082.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/nedatetitikabal.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/nugubafunino.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8722e4f253---widawema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=whale+electric+rice+cooker+manualPDF 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_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 10512 bytes
SHA-256: 7430ad58057d9efafc19afa0b22c338b2afde213c6fea0cf9c5a6b013b957cd7
font_01_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 17520 bytes
SHA-256: 48f7c95c3991032968309d3848bf6a40b82c1ca7cd9a65abfe57416282a6285a
font_02_sfnt_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1