Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1863df383da872…

MALICIOUS

PDF

78.1 KB Created: 2021-09-09 10:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17e97864a5bd033ef4c4c3d51d572998 SHA-1: 5e7a18aa9e49f272d58e352890b517e6144d3b6f SHA-256: 4a1863df383da872781b40ba035c6f166b6ab571f023710a54418a636e4708e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external links, many pointing to potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or downloads. The embedded JavaScript is a common technique for executing malicious code or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aptekainternetowa.net/_mdm_apteki/file/32936612963.pdf In PDF document text
    • http://delfosventures.net/userfiles/files/bomixopovudeseg.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/54561684819.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/wekarurodareg.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/74db4b111c435ce695e3983367b0bd9f/3456167765.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392f0aa1586---namubodotuvenekiruxom.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/69835336419.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161365d69057a4---62769051992.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136be57e7d44---xadaxidomatazufipazorikud.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8b4cc20b---55555998370.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///15978923046.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613454cb2f9a8---86397143780.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139851cd6e6c---moridul.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/1303077331.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/putedu.pdfIn PDF document text
    • http://chinalabware.net/d/files/galunekomufateduset.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/88751594023.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/75887003537.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/fabavofum.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/nelapupakuti.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/lurexamovopetiv.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/93857805389.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109041418475282.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/022203325098.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ad266f7e4800d7d74bd24c0e702ea42/fenotuzukewabuluwejemaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=audio+evolution+mobile+studio+apk+full+cracked+downloadPDF 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_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 17488 bytes
SHA-256: 64e756182b4775956ece1f3ef0d2fe32d5a5e6e4e6a198d4bbbc61235e301dd5
font_01_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 11248 bytes
SHA-256: 79c0e9b9ee77801c459c19f9054e589f4ceff780f684722c2cea56545055bfc7