Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9736eaf03f72eac…

MALICIOUS

PDF

102.5 KB Created: 2021-09-06 09:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71fdcf3f5a34212031d77521271b9814 SHA-1: 8270f27c583b92db4ba976e6078df3e0a3b9e8ee SHA-256: d9736eaf03f72eaceca93d8541ad5e80d065310d380eee47a901aad64677d9f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics suggest this PDF is used to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b74da28aa---zimujidaparab.pdf In PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/gizeporewufifafaraguzilad.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/xepidetozofivukuwaf.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c1dbaddb9---tepoxatovenuveterizol.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/54519528637.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/437f3fd8acaa86b5c124ba2006a5c21b/87761903993.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/kilosatad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f16ed9772---85464434837.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/64727439602.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae9dceb348---80293139874.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/87807732914.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/73ce1ff37aee3748c30a7f48201f2717/53925420529.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/gafikadug.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfee060e3---tadopizexox.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/cvkvf7ckg6b65pjpau4t5nm1oa/tiwiroxameg.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a291aa9bfd3---lezerodazil.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/26eb63b4f1f989838c0963e9aa48701c/dasavozasa.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfaa503b51---43807875093.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/t2hrke55q2qc4l244dt445fke7/20020485257.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/jomexugegasuwebub.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/88137681319.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/givijevufamovogis.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/torugeguxerafanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ghana+labour+act+2007+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_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 10896 bytes
SHA-256: 20a1d4b155ec0bb0c263a1b5ba3f53e0e063d48dcc3138521bbd94c464118f3d
font_01_sfnt_off00014376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14376 18812 bytes
SHA-256: 6759980c2e8f38f801cb7f383d38b93e196640553e8f792135cd81a969b444f4
font_02_sfnt_off00017449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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