Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c5b9ab57244cc0…

MALICIOUS

PDF

89.4 KB Created: 2021-07-19 04:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3244d26d47290f1503fc8b3042dfd85 SHA-1: ca992e7f8c11412324ae6c0beefdbf714ee480ce SHA-256: 04c5b9ab57244cc0f718122255c2c0a76743296602d611912eb365bf8af51499
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to host malicious content or redirect users to phishing sites. The presence of a 'download button' heuristic further supports the idea that the document is intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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 http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607106a76159e---nesafokisoged.pdf In PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8cf7189de5e94e9e01389a139245dae3/10867602002.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210624_3B9C8A56F64CB87A.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7532447de6---vevatemarekopuku.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c0e905b27---titajiwanurevav.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/26366176841.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b1c309f16---30953351201.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076c21472b0c---91914859146.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5df51d8ac9---lugewuzazuvinopelu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/bavemebo.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/rezonorefonujoseta.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/43b77d4992fb212f5a2d5f5d7d7e4015/65492506645.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/76069728256.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/14417c5534ea91807d181c063c0b2986/fotami.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/a69hvhvhumrduf7punf87bnvr7/rikobagipejenujow.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210625/file/zosuzozonolagukujijafol.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aca0e0d0cd1---37166698411.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956aec8b0b4---32433612699.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607912de43323---7578491748.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/96928507709.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5640cf167e2f65434e71eca3b7773f66/66706289981.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607677701001b---tavosemebepudetazak.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/tirizijuvumiguwu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f6a7c044e---35750494344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=long+division+questions+and+answersPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/dikudedirafulamo.pdfIn 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://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_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 10732 bytes
SHA-256: 33974a8c6dc87d40f48e4f24598594ab63b7b629182231a42568796f3cc1bf5a
font_01_sfnt_off000111f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 17496 bytes
SHA-256: abaf8b60833e62970b756c288fbbec18b835c3d2db46f1b17e750006927b14d6
font_02_sfnt_off00014008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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