Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94db5d078f4ccf0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 15:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b1a3e9fbdeb609d32b8d6bb3bbcea98 SHA-1: 043a7251cad7e16487e7907a8c99adb479bb5601 SHA-256: b94db5d078f4ccf026bb26813e12ad0fdfa3c418c3b68157ee477a8062956af0
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a malformed exploit stream and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting the primary goal is to redirect users to malicious content. The presence of a download button lure further supports this phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://varida-tech.com/ckfinder/userfiles/files/gironamigif.pdf In PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/rakite.pdfIn PDF document text
    • http://salt17.com/userfiles/files/lulijazuf.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/gotarobijodejugugudikeniz.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840a6c8d794---40057993764.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2139738d99---galuvabagolozazapud.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210621064119.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/lorozazomagafanubakef.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/813de594ca495e8ffbb7d4dd03835185/94303563139.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108101044342872.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/08d53a16babfe46fc14369af8a3bbec7/37466348461.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b860f447da22ff92ef2a04e366710385/96105610750.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/sotuzuzapotu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lm4o9naekr1lnqar7iirmnapdf/ropuveburiw.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607511e1afcef---45766163311.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/81394754237.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/zanoxebesepibas.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/temawedosizododoji.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb869038bd0---xebur.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/fanopuliro.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebba4c4eed---fapiwejiwavilajojune.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4150b7e1a9bd96bbd94da43bd4419cc8/19863141044.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b75013f191d76c9f4978d5c1ad3b4c17/86812748844.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ea74509cd92e29bde4678a67d3c0042b/13498945683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+human+centipede+movie+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 17852 bytes
SHA-256: 71ee6fbb2206bc6b85be0092c3a39e6d2fd06fe385942e541b83f38f7de0cc7c
font_02_sfnt_off00012ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE3 10932 bytes
SHA-256: 9f058bafb195492e0c446bac36ef81fb21a95c0171008d97e26b311e6172d5dc

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