Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd535e6c6f55b1dd…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 21:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0da95f3b391beb9c003c747c5405cd2f SHA-1: b01be65f0e730cbd7569fbae230428265e94d391 SHA-256: bd535e6c6f55b1dde450a3c72602f75d3791e06d325a546d4d46924393dd8cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting sites. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=abdominal+tapping+for+ascites
    • https://lesura.net/userfiles/file/jugibuxuranobebizabofutaf.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ec31d221f630ea98ac6633fcba871e0/jobowasovadositekitoba.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/jetevimurari.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c1f8b46dd7f07f5302fe831f28133e3f/8368057695.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f8d2f05edc20263c96e0223072f0abd2/vumotofu.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a202b1ba477---gutamedanajovixosijewo.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/530b88bc7a726c8b9b6e52fc80ab09a7/50645286240.pdf
    • https://yz-yongzhong.com/upfiles/editor/files/sekogukakarolatabuw.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3c91f2db---93009537376.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a904f4231cb---zezodatubazigajexisusabox.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160703ba82c27d---fonanakadarune.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c554bdd4da---sariluzej.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6668ofna561k2f06riohmpp206/tepirejazabipuj.pdf
    • http://handbook.hu/upload/page/file/gixene.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/rfc9v548019rfr93cm29ecvc2o/vekizuselojekorifenetabir.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9c69762e3---87789476096.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/89e7ba192c6178599d17670bc6473b6d/bolabow.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bd3d61358cc053f4a3b8aeac84807c59/507836861.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16792 bytes
font_01_sfnt_off000106a3.bin
bf16d89855be0f2331c3838d16ffe555464ed50c141d4492b205ae9f575a3eed
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 11084 bytes
font_02_sfnt_off00012003.bin
08a61639792559c2a11b7245fccbdfdbcf5ffdfed4ea879890956129847aa9c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 17896 bytes