Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2f651615a7db3d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 00:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d649b8947f689b8e0dcc352ba4c3a5c6 SHA-1: 1dfecca3129bbc0b9231613c7884efd74ae96fbd SHA-256: af2f651615a7db3d7f9348934c67591373b83d885de669be615c4ca2549d6a9a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc443d73791---tudogugalidivofubuxef.pdf In PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a894c487e080d9446234de15764a3550/6851837687.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e51913f1---dobuvotorogox.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/wumugazupobepulibile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b9dcc4845---zexowalibenanisita.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/66895571982.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/gugexuxedejabuvomired.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/84779772265.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/25969377643.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/76966752137.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/77676672905.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/36297949328.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/zirox.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/3e16be3fd9ed09021037c2d5cdf06599/zadudojenif.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/lewozeme.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/31893450131.pdfIn PDF document text
    • http://cga82.com/admin/File/dufibeluv.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/nesizisupulo.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/xowadinolujevowaxopate.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/konekemotikusasap.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/34327285495.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/49k7757i244v5kq99tgiqkkm84/69160922445.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/42836946625.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/8129abcace707db776424372ac28dd54/5613081514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=who+am+i+to+stand+in+your+way+lyrics+pdfPDF 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_off0000c454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 16652 bytes
SHA-256: 2861085185672b4cb5b58e016292aa0c037e2b7facac2db78fb251fde1e62eb4
font_02_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 11048 bytes
SHA-256: ad2794d3d7ca348addcef7279fb49da9bfc8a43f649dab5a733fe884ca1de670