Malicious PDF — malware analysis report

Static analysis result for SHA-256 1816af13da5c5366…

MALICIOUS

PDF

82.0 KB Created: 2021-06-29 12:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7cb9fb4763ee9781c9f0b14f69a8915f SHA-1: 0924ba0d85e9f108e53b022190db49052e65f9eb SHA-256: 1816af13da5c5366f811997b6a559ec7dbb193937a8bd1e89173d6fdc428c739
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised or disposable domains, forming a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the structure suggests a malicious intent to leverage external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://cz-synergy.cz/data/file/16016383340.pdf In PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4q4bdg6c626d5r7g1pdt28dfh4/wisavefisomepisarodux.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c27285c6b---62131459571.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/21698559fdbf243d8f0aa39d6740af6f/56725935889.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f074179e18---polalisi.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210518201101.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609447744274d---39214889423.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c0c90d734---44254896429.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/39443880158.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/renirejixujuz.pdfIn PDF document text
    • http://iccarrentals.com/files/file/89727906937.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/11765698468.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/50792502932.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0mau8k0dtdseh9vqcvlmvumikb/51234963158.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/49244586953.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160883497ba41b---kijopidavel.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/56215571608.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/597c4fe7bc09274c1642e89d89214db2/55436597502.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/97300479400.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/115872824260cb51aa3c815.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/90m49kkjt52dncnovn6tk8r0hu/bidemomovutililulur.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/oobh68ftp7pcstf5rosacndrii/wiwafedaragep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jeff+cavaliere+22+day+absPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 10580 bytes
SHA-256: 27207fc78c06148aac273a292ac0de162b81f573ce2c426779f7e6be1f04df62
font_02_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 17740 bytes
SHA-256: 86e447621e7762c4cf760981306a6200674351ed140723969cd981ce5a468a84

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