Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a71c5a901c3acaf…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 04:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7be5fb6930bd9daf74a8017fa0c81ce7 SHA-1: c04355772d71549eac84eb8aee06d89e2bd84ed6 SHA-256: 8a71c5a901c3acaf6b2ed72feb88c67c349c37facf7b2fbdd8cd61a55370a79f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. It contains an embedded JavaScript stream and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://flemingdecal.com/uploads/assets/file/10699419678.pdf In PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/tesaminejabozo.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/sujuwisewoxizetatisow.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/jijenisibak.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/66710573389.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/72141531816.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/bapekifusejilexuwave.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/25655352284.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406d6cac4f2---94533807250.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/bidojiremodoxesalufab.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/tazalen.pdfIn PDF document text
    • https://vleek.com/uploads/files/senesolaz.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/gasip.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/numofagokox.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/2693336425.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b9f0894e1cc0bb5cb9be95366bf31a1d/67399265133.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/kawisezef.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1540bed4d72d618013373fbd5de896e8/57253228401.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/kirukan.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/gibanowodedojutusax.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/kidetukepar.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/64459624707.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/78620973675.pdfIn PDF document text
    • http://standardamulet.com/files/files/fijusena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bella+ciao+mp3+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD87 10620 bytes
SHA-256: 64714effd1078d663685ac2c4a2dab5f2db6387b2c362d2cd9bbdabe47e06c72
font_01_sfnt_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 21688 bytes
SHA-256: 781ca1ef461fe7265bb370664e50307388f9df5cd3f29f775ca65731b00fd457
font_03_sfnt_off000114a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_04_sfnt_off00012a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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