Malicious PDF — malware analysis report

Static analysis result for SHA-256 be96497377514fbe…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 08:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbc3df6645492f0d97d3a0c31b121f27 SHA-1: 04b5642f4d03bfcff161131c9509d4f06adf4656 SHA-256: be96497377514fbe74b046a957efbdeb5f170c238d05bd754469c34235feb0db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and numerous external links suggest it is designed to facilitate initial access via spearphishing, leading users to potentially download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=how+to+pray+for+the+nation PDF link annotation
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/buwopefaxigapo.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/34563864082.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/bilupez.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/22570709690.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c52be9a8410---13348172030.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/16618281524.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4f2abf58f55491ffe5c115ab630cd249/92421487426.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b60fc73d68c---78880252160.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/a1d42a91dfb4c921086a5ff9e7c5b247/fosazibenorip.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/16761907815.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9e5e6262---nuwujibadigiwitizasagiva.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/54529158878.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/fabegufonobori.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5f386a210---14152863707.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a00abd25---70140720060.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f260dbe2e3---gokimad.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/laviva.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/sasikefuxegilotitik.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zomixejorobuvopiwukus.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/pusavaxetigevebemela.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b8dad013---tiwutuxuxobuma.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608664068849a---63766801901.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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 10432 bytes
SHA-256: 41ba8af53df81792f1dbe8e62dcc5e4a1dfd59ceca63313ddac19606c41e0bab
font_01_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 18296 bytes
SHA-256: 3ab30a86e97d0eb1a81fe0a988f17ce3e9d50057710cf95d74c1f0b5a1002e10
font_02_sfnt_off00011c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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