Malicious PDF — malware analysis report

Static analysis result for SHA-256 16398f99a0163efd…

MALICIOUS

PDF

86.9 KB Created: 2021-09-08 05:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75a3d32fa76538ddb13f0d6063611a02 SHA-1: e9182369451dedb3661ae395d1d02fa00d25c477 SHA-256: 16398f99a0163efd93ee7170e49e2c726975070bde600d0100c6d7ebf9a96224
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://sbriz.ru/userfiles/file/megerenajewiduzilakamip.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160834e4197dd3---58858433989.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/kinojapefefo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ced736d13---xuzarerixi.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/80015279706.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/76178901049.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610f97d9be---kujegesusesomivexuvam.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/fozututaparoxer.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/pewitoga.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/80300572003.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19968046358.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e821c2e4b2---pakipi.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/75861597246.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/87928878476.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/64396693287.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/dofejofabifovina.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f1d32d64---22491436686.pdfIn PDF document text
    • http://usmleworkout.com/files/file/vuribatubu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a58047ad43---47699590991.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/58221662031.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xabadoketuwivote.pdfIn PDF document text
    • https://soechi.com/userfiles/file/muxusesigiwuguwagugix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=aprender+conectados+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_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 10456 bytes
SHA-256: bbdfa2fe0d629f3f28c6d2be5a9745191bcc2394d41866628bb94e02a1fe1314
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 20316 bytes
SHA-256: 91b85264374b0fb2ee49a4085d27d46c2fbe9c6e6513296dbe63ffc0a5d4bfa2
font_02_sfnt_off0001361a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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