Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be8cf1c4d4d8f66…

MALICIOUS

PDF

84.3 KB Created: 2021-07-10 12:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ad6d6e9c1cac2aa16b1e89b27b86247 SHA-1: 7c103a4832be3be7770b23613b3b94b62725be6e SHA-256: 3be8cf1c4d4d8f6608d43fc95934bcc4489727fe5a0072e7a8ec2f7c1ce3086c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://irlanc.ru/uplcv?utm_term=blind+barnabas+in+the+bible PDF link annotation
    • https://topclassgreenery.nl/images/file/zemujesekijuzovaxafoselu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160950d018520d---tupudixejijosuki.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/9uv6vl71jqjj544l57nt6bjtgg/35694627434.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/bezijolerelibifaw.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e701ae54---xokagireni.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6af1a5f73744f071b3a42a4f630feec0/28096180720.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/5rjsn1sgk6f35gdda42o9ucf06/99444345889.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1462db8a7a6e9bc523daff97176539db/mijosakezikosugezox.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/41559433943.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f1f50771bb08c889b33515b20328b8b7/jakajujabokupituratezot.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/29mbkadahf029p1efo90hcp9m4/benudimetukiwutotitofixo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/l6ouqjaga7v3gb75tgurbb9lj1/15739880014.pdfIn PDF document text
    • http://artospace.com/pics/file/55619906484.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/80d69fc337cbd4dfbc8a41e5bde06aa3/mufaxubuzekabiwega.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e9d769812e7be5e5624f59263a9b04b8/37645417526.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c11f1d75ce6f2e188b40d158ae465305/wixanigenevexubotunirawe.pdfIn PDF document text
    • http://banquat.com/userfiles/files/rudamuvawotakuzup.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e56770585---23139249377.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/78512842912.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/37250111078.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/duriduvowodugowazox.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/punit.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/413fe82a7d2f243b9f99ef31f59f961b/80684570289.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/67069449044.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f7bd588833e52a085384b195627da116/32880981110.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/3c0gpkj3up8rhl0tmq9t7ie1al/wikosunijijadefitoleje.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_off0000e972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 10420 bytes
SHA-256: a07a420a57827afcce0411872d95bfcb44207eb4ec01356366bf3d0017a846da
font_02_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 16500 bytes
SHA-256: e04cbb7a6710e42790951ed34fad52c45c8d7bf1d767d0a5fe2d89efa424a0d3

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