Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bae9807dde1ed2…

MALICIOUS

PDF

73.4 KB Created: 2021-09-04 09:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b53a7604dad5d774ef95160b7889014 SHA-1: c4387986a7788e2a022dd22ba1ca6db4a2118d1f SHA-256: 28bae9807dde1ed2c3d9fa2f0f9b8cd6ba226b29754ab9fd4ca4af8590d2fbd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, characteristic of a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.malagatour.es/ckfinder/userfiles/files/56026077134.pdf In PDF document text
    • https://aonetreks.com/uploads/file/20582574829.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/bomawab.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/dc11965f87c601a678f089907f50719f/90071228974.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d25ba43a8ab1a27ff1ad48da2de52723/sunenetikesawewenugo.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/11887182239.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/31015983201.pdfIn PDF document text
    • https://ibericadearmerias.com/file/jalozemelofadum.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/xiwixarikugodekazuzowe.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/48649529023.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210615204252_gthp0t.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/23610978122.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a465b2db0---72140195791.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/sewoza.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/6033762904.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de20b1bf58a---kuboxujukarafu.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/riviravujipafadibo.pdfIn PDF document text
    • http://htwy.com/upload/file/wilomagepozefugagetirad.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/1f18a0a08858ad1bcdcc6e616c02c21a/najinaredabezilolesuwo.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093a10b3a944---jekuliran.pdfIn PDF document text
    • https://senhewood.com/d/files/65322161814.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/97d9c7d93ccffbc5f08a9d5548902d67/66124832044.pdfIn PDF document text
    • https://studiorampinelli.com/file/bevitasowuxiw.pdfIn PDF document text
    • http://megalaserasia.com/upload///widakufamugafuredoxasir.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/mijapanexazulojew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=deductive+inductive+and+abductive+reasoning+pdfPDF 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_off0000be2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2C 11056 bytes
SHA-256: fdb3dec622534a217867ce68b55bdfd5e0eecee5b6599f6931f8380aa115aaea
font_01_sfnt_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 15668 bytes
SHA-256: 1a77936f3cb5e99ee543928273cf04ce47a007335889f6a662bcf3b3c2c88992

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