Malicious PDF — malware analysis report

Static analysis result for SHA-256 394f8cb7a137212c…

MALICIOUS

PDF

88.2 KB Created: 2021-06-30 19:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae04dd86dc5d3ad8290afaf90be83f0e SHA-1: 1bc7554a4e67b80c7142ffcd365cef159ad87992 SHA-256: 394f8cb7a137212cc629975e263f21757d679d38ce3d0ff007881a5d3b93d656
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://archism.ru/uplcv?utm_term=speech+therapy+attention+goals PDF link annotation
    • https://birgatour.mn/js/ckfinder/userfiles/files/melitamikisa.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/mebetutivom.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160775ad294d90---55641521932.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da982ae2fc5---19563997757.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2e98325138c40a3991890d76e7723cfa/watuzoso.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/48206550077.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/da2ef76e66f128c8f1d33ae371e51bc6/19150525623.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/61936720905.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6f64fb60ee28fea49cca0ab44d05d356/bazupeguwizedelaxase.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e7310ff8---senaraledepuzoj.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee87010ab6---56220045778.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ac4f0be5ebba7607611f39e8ef617941/pofixetedufofolozux.pdfIn PDF document text
    • https://menu2uplus.com/images/file/98978522213.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/4470800132.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11c0007bef---55092910725.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d50a51ed---dewiwowuxojetinewi.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210610_B504C2D768BAA323.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/vepuvosega.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/108e4127d052b4e2617dd8bce442e01c/15110142096.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/n2fp7pod1k7vu3engmm29vogu7/26307063915.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/sigoguvo.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/wesujokezol.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/bumofenipesopubagugelamop.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/a70078dc9ef70c9090ee35d3b936e7c3/vukepolebuwikovudelix.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/g5hfqpvicq48du97e8tj1o52vr/remivizakagiguxuzinanan.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/63307035567.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/cc269f9d5e36ee14274bfd1f304cbbcd/fuwejepafow.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_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 17288 bytes
SHA-256: c52ce7c969df1d7d2ddf01a0b966fd06e78b3237a47e5576f98a7bd921ad0a05
font_01_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 10840 bytes
SHA-256: db3d6795d0de9707e12cb8b42313353f82ccc8d4bdad4ccc05c789ec0a050eef
font_02_sfnt_off00013b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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