Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfcac2c3d6ea589…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 22:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f69c7f4f8ee01097eec093ea0162d7b7 SHA-1: 96d776cde53fdd137aa19c3be5a732ca48f31d31 SHA-256: 9cfcac2c3d6ea58968363e69edf87a64a1b14a0efb44171da0b3e030d69cfcbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://inwebjor.ru/uplcv?utm_term=najszybsza+przegl%C4%85darka+android PDF link annotation
    • https://phuquiland.com/upload/files/64475550313.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7360f2ff182e4e795ea906960697e4d0/11834061730.pdfIn PDF document text
    • https://tigaintan.com/contents/files/kuzulenulodalojigekaruku.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/renev.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/tidixizowezofo.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/63954316745.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/38987306402.pdfIn PDF document text
    • http://gabortech.com/admin/file/90281087660.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/nilul.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/xuwudipuvevidogez.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/merikolovamofunuzoxepuru.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/misekar.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/wuzufosu.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/zebuxalijagaritorupi.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/43982658454.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e57fa11d8---suragetekowaxamatizuludaf.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a6f171fd6f0af652f8e82a3af6c5ff8a/jabomefatibuzipavib.pdfIn PDF document text
    • https://cmf8.ir/data/file/bunevixupidekixuwitasor.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7f3e0e3722389d3d91c946ce25ca061a/66094195789.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gbd147274s6md3lg29ne9ap1jq/wovab.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/88713118042.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/38726373399.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/fitaragipelopupaloxokofi.pdfIn PDF document text
    • 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_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 11220 bytes
SHA-256: c864beae16941da7cab0fefd0ce1af25e6ca0bc1f95c7b92a6ec798fb5860cda
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 18716 bytes
SHA-256: 40bf746312b5f35439faf138ca30f48a79e68fcbde29f0d8fa302d1ddcd4e013

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