Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ed56fedf7efa63…

MALICIOUS

PDF

75.5 KB Created: 2021-06-14 21:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 23ffcc6678bd6159778ca9577d9fd5c9 SHA-1: d14795b623dfe8e9c57fbf61cead8e7e69af60e8 SHA-256: 86ed56fedf7efa635c1950509ccd4a916b283ab3f8f7e363794249ad3e590a79
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and multiple external URIs, some pointing to IP addresses and compromised WordPress sites. The presence of a fake CAPTCHA heuristic indicates the document is designed to deceive users into performing an action, likely to execute further malicious code or download a payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://catamma.ru/uplcv?utm_term=the+sims+4+mobile+apk PDF link annotation
    • http://inter-travel.hu/_user/file/39121514131.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/jalesazajati.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/romojekobeve.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607faaf12bf82---47724520341.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/584254ebf29e0be23f8b5bf797c63014/rezafegazuwasugetojilesa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973b96741c6---gifabinisusupaboxi.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/98375727424.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/liwodino.pdfPDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bf97c907df3---75940849813.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c426adca1d1---dejigiwufapiwisukeriw.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/gubegikagukud.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b3d551a2---36848954103.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/revukufokifubetul.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/684f8358e4921ecd06f0a744d4987a28/lusadowizajomavejukob.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959b1f0d461---64300633711.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608947399384b---90376839911.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082107105a4b---nenekunijuwij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 5204 bytes
SHA-256: 8c90f36628305b31e15397ad4b886e5e19a97c1ba220ca215183d3cff4aa15af
font_01_sfnt_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 10420 bytes
SHA-256: 63879b6d1bc35eaeb735ffd45886f422ce3402697e8ea2db0f045f613f60f5b1

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