Malicious PDF — malware analysis report

Static analysis result for SHA-256 0050d0a590e2e38d…

MALICIOUS

PDF

91.0 KB Created: 2021-08-02 21:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a4df477988929c55f771d1d939324f2 SHA-1: b6353ef400ef8125836f511933c9f317c006b179 SHA-256: 0050d0a590e2e38d4a8168c307edb34c3d20af65f1da3b7d7a6a0c7916ac4d79
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a likely attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/00ee71df466d17b4769e5d8cbdc40d0f/tuwivobowowesagusej.pdf In PDF document text
    • http://smflow.in/admin/uploads/file/30570234698.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bb75cae2a9dd2d32b4b80774b77b9865/16329175547.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0i3cpao6lh5e864h3rkgml38p3/90096339469.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac098729928---89229241731.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/7018032142.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c424d25f09---71482337519.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c09155bd63cac3504cd1d5e95e8a9a78/1401732010.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9521aad89e---84239934048.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/16qojrib5k70kbgo8c8t9v83e4/90401603129.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/78463882625.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/903e21f4f785f0939a9b5b124dff20a5/kexeguso.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/vozoladafuririw.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/838719a3be3cc3ad3bf5eefc6a00a7ef/joxuxupofebizuni.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/59877f6e713c783ab1707934bc807d2a/rerabukopakogafezapo.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/vivugibajisuje.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1b83f5eda1640cab2094bdc90d30dd63/28814826285.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0cfe1f8c8ba75d506f489dba4a93d378/zalifesujiriborirenabuk.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/64945638320.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/wuliniper.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/narewedusijanejevavowuke.pdfIn PDF document text
    • https://x-software.cz/data/file/56399000326.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/me41c0dd5a2q3fmbd2eumo2u17/90181765280.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/1092656343.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c20d6e30ebf---7217760296.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/mibajelez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cobra+360+laser+14+band+codesPDF 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_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 10936 bytes
SHA-256: a4a2d344d945b252944372a915cb55fb997a3df1c757b8989526e9d678bcc886
font_01_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 20204 bytes
SHA-256: 40e9eed2b06d1dfb93bf40302aa6d081e4ac19ae8c090833aa138ffb91a35973

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