Malicious PDF — malware analysis report

Static analysis result for SHA-256 886da3fa4baea0d6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 18:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4efeda25eda5ca36037d1544bbb6767e SHA-1: 830efc090e19de2aeeff9f6eafad1bbe8d4608ee SHA-256: 886da3fa4baea0d6813d0a4720efc10096ad68dace81d3f9bf79aa1ef04bce42
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160866cbec5a44---poxexedorisetitapabu.pdf In PDF document text
    • https://pet-fashion.ro/mm/file/240626028.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/jar57m44e08s9ba5k45pam2647/52670952133.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/pezolimewiz.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beebd342ca1---kafulemugusawazomotitoti.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afb27ae1adc---lajupinotovi.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214292218438929.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/77930123101.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8g7ru76fndin4ocbolpsn0mt32/3466129534.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/dinabitawazetuvexiwamazal.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/me8dvbqq6nnane8f8vno687ehl/gupezasuwiditunogafemita.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/26655295845.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/musofogubimuba.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38ee46ea1a---11428151053.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/sopopibesuxenuf.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc876dbac0---59167551354.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/83421462823.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jelivojiwibaja.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/16055810847.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/lakotunemisulak.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a9c263b9b---58169423828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=anaphylactic+shock+%E0%B8%84%E0%B8%B7%E0%B8%AD+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAB 10672 bytes
SHA-256: bf36afd784e5c18c1777026881990bfeab438cae745c4d5ae724f4342c800868
font_01_sfnt_off0000d321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_03_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 20928 bytes
SHA-256: 64cc2f476cc9ac10c7f608df500d29ca3ce594509fae0a78739b07ecf1a879f4

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