Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fc8a9b19d821f5…

MALICIOUS

PDF

82.5 KB Created: 2021-07-12 16:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c2730a16b7849d715191848bbf8c7879 SHA-1: 39a0603552ed1e8d5da11d12811afc0729388809 SHA-256: 79fc8a9b19d821f504380ef03befd56ea2815fff337c0790164a851197f53fd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host or redirect to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/969c4635b9fa014b36911141a7824b14/dakotureguwutamabusoziwot.pdf In PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/72893029702.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/34923488de9baa0e843faa7bdb501bcf/12370215782.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160962daf08fe8---suzomi.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/lazezudibitilozomijasi.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/24986496218.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/ropizilakodivepogo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5d543515---zitokelaxisizusexinuw.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b76102c7---89091207252.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee01ecee3---zezikow.pdfIn PDF document text
    • http://nessium.net/userfiles/file/84883975150.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/wepixutoketoze.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/fojijad.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ef25e845---nisilogipokagi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/3hool8l23r9bib3mpr5ng17114/25219281967.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d309f9cf127---pajeka.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/12a7b3bff7e11ad80a7ec2f3ce01883b/jegutemisirefo.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/dilit.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/ramofe.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/livitasakulunikopu.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/86953164054.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/18/file/20210518_113049_172.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/27690604569.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///sigewuboxe.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/biledubidizotidusogexa.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/gogosojivev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=injunctive+relief+and+damagesPDF 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_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 10944 bytes
SHA-256: 88d4057cb9d3c5b8bd33403f8eea4442a9d9a12705e53212eca4c9f424c04e8c
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 16780 bytes
SHA-256: ee831657182f9f99f4e980ec66fc9e9b6513c0698e979b17e4bea820e798406a

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