Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51837c7da571d59…

MALICIOUS

PDF

86.0 KB Created: 2021-08-13 15:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af4dcf23d25ddf1a7ed2c2cf00233616 SHA-1: 4bdac01d0aa7060ef546769f07b1ea0321485209 SHA-256: e51837c7da571d59025cddf17e0a20333c7df9efa0889e523f197effaf1c425c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm that redirects to multiple external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver a secondary payload. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d7fad498c6ccac26378e4190b92de2c4/54941731772.pdf In PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/06f6403ae11b722af997818386c0da5d/18282071813.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/551e40fd875cb9bf4567df2bdc81b613/37845636463.pdfIn PDF document text
    • https://mmszke.hu/files/file/zolekogesorukamutufemuvil.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/jumimasazofijodapew.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/797faf935892391a38204c92f6d99daf/mojamazowubesatelageruba.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/xumufokuvewaparumaru.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a94392c5f18---jigewiwesoru.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/94488183249.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/57084617072.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/fadipazozepav.pdfIn PDF document text
    • https://areicon.com/images/file/binuvaperajil.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608756710820a---vimujokosakozodexurosano.pdfIn PDF document text
    • http://kgmda.com/upload/files/devamo.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/muxokapabitalusutefa.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/27295178120.pdfIn PDF document text
    • https://maviet.vn/upload/files/soxakezedimitizulilovod.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/85675797425.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/mabokata.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b101f311651---88714408749.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xeximesajoxasixofuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=michael+vey+last+book+summaryPDF 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_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 10896 bytes
SHA-256: 7cff7dc08eaeff132b3d239aeea25c42827aa917477168cbcc7132b6ef4ca199
font_01_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 17056 bytes
SHA-256: 7f97baed87441c0330814c4f062d76e76389f22cce50ef8e23dd0ed9f8930f6c

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