Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef8f59d65a4c77a…

MALICIOUS

PDF

88.3 KB Created: 2021-09-10 12:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa0c3b3568f26c62205ea1629df6dd90 SHA-1: fa07c202e18d38e55731037c8ab198d3b8def254 SHA-256: 6ef8f59d65a4c77a6cd91c5268145f3b652bf1e369826a6f5ca99caa54304f53
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Access Token T1056.004 Webnamese

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's designed as a link farm and specifically targets MFA or one-time code harvesting, suggesting an attempt to steal credentials or session tokens. The presence of multiple external URIs, some hosted on potentially compromised or disposable domains, further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://artedelvalle.cl/gal/files/file/wixapumopodobinovuna.pdf In PDF document text
    • http://capital96.com/userfiles/file/fenowekomigav.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/81363437211.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/90294773564.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gekarelizimafurupariz.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090806325453.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/47083107889.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/081758337920.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/tonuluwaxixizezul.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/bokurelumopi.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/22099822524.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/51154931813.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/df3700d627fa807f31a86f602ea8e48a/migigogolilekivegafevab.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/97535483096.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/jusegefolosasujumamadug.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/jevegoresinujefa.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109011046515401.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/minal.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/40082262999.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/xosasavopizividejus.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130cfc5a3a78---4162131261.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d7d9971d1f89a2097f3e586444753150/nabufunaxeturava.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/mezoxige.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307bb038d32---3956008971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+break+lock+screen+passwordPDF 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_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 18308 bytes
SHA-256: 2a16caea54d30f91df699c1be3d336169215358c9a99af863cb0ec1f35c1e1ce
font_01_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 10724 bytes
SHA-256: 8e5061ae62beb1c11ad3b8047c81400021e796b59dd9f71aa75dece5a9399912
font_02_sfnt_off00013b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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