Malicious PDF — malware analysis report

Static analysis result for SHA-256 453ca442e6ba2ca6…

MALICIOUS

PDF

84.6 KB Created: 2021-07-21 07:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf8deefedd1d2af4f1563b61b467305c SHA-1: ae3c10409d6b04aae6d25cc8376e2956fe348c14 SHA-256: 453ca442e6ba2ca659de8c81fe1b9eec2a84e1c0862ed2c5e54c232c3ee713d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript further supports the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c27285c6b---62131459571.pdf In PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/726b1a6fa4c6e21c7135e99521ed42ca/dobivekomovoxevosurawavu.pdfIn PDF document text
    • http://leton.pl/userfiles/file/fodojaxiwop.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/210dd664d9d01e2cf37b8ae9c0941b62/45852275031.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/93944332060.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/98241737706.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/jonalelexunesanolu.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/larulerinidaz.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/lemadivaginilukan.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/fugejegajiged.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160807c0a80bd8---derujokusuzobidoz.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/31496579371.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/sakabixiwerotedatizazux.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a297369636011eb7b18c825f0a60218e/26774712331.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a937129fbb48d5f1ee147d9d33956ce8/97704124185.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3u44i1toors3c1bdujf3nqkm27/bevenas.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef86cdf200---41816095776.pdfIn PDF document text
    • https://mmszke.hu/files/file/mumovufojapowi.pdfIn PDF document text
    • http://expresskaliski.info/file/42610407181.pdfIn PDF document text
    • http://bjallstar.com/upload/file/zesubewotunarunoraxis.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/kokowuporamuwijimigitela.pdfIn PDF document text
    • http://altinay-law.com/images/file/93662003466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=house+party+modPDF 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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 10516 bytes
SHA-256: 55a5b4fbaa0ec5264f59bc3b8e68ac36d4e4f29f3c0b1fa76bdaa319422f0683
font_01_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 16996 bytes
SHA-256: cea780060645ebc7c30d58cadf7477b2f44e0dfdd14addb309729617f07e14b8
font_02_sfnt_off00012c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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