Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00f3adb458ddabe…

MALICIOUS

PDF

72.8 KB Created: 2021-09-12 18:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 134bc15c58da68dbb20289ccc4859e55 SHA-1: 4937c8d2632413f462ddef5222cffc8f459a9f62 SHA-256: e00f3adb458ddabe21e8bbab05ee3e4d32dc4e2a004d784f810ab051a1ef44f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms designed to host further malicious content. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tsutae-f.com/js/upload/files/jesus.pdf In PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/30923384476.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/68622873567.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d0e62bdd0---bilunijenigadof.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2807bbdf2---80648890860.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/xegejub.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/aa6faf31f442e4cda4b48728e755f2c9/64455007083.pdfIn PDF document text
    • http://sooclose.eu/upload/File/gezawipesokeloxipabesupa.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/goniwogagexujizegolib.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/73759450980.pdfIn PDF document text
    • https://magerp.org/upload/files/98955531373.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/68253880360.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/63438400271.pdfIn PDF document text
    • http://schokozentrale.de/idata/kopowobop.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/58975187978.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/29627151555.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/88482908095.pdfIn PDF document text
    • http://mfahk.com/upload/files/folekasare.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/segamapunexas.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/29160203529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=best+call+recorder+for+samsung+note+9PDF 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_off0000b7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D3 17176 bytes
SHA-256: 3f5e5f8761e6a6ebc3d8a888e5e892f4d0f6c2fe57b4d60381d4f3039a7b4897
font_01_sfnt_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 11048 bytes
SHA-256: 53a2db531cea5efef247f0e78633776a93fdd1f0f2cae9c4024a605faad617f1
font_02_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1