Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3fe5382c7a6153…

MALICIOUS

PDF

69.1 KB Created: 2021-09-11 05:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4b9729d080d22787dda99312225c1ae SHA-1: 10f3b31ecb8843b9871a7e160e211316a5ea4cf9 SHA-256: 9c3fe5382c7a615315417c98e9699b3538c8fd969fe9ffdc8073b0bfedbc2ad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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 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://pinyardim.com/calisma2/files/uploads/sadorazefewasifugujako.pdf In PDF document text
    • http://dailythang.com/userfiles/files/4478447443.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe99656bd---dagez.pdfIn PDF document text
    • http://laduses.nl/image/file/92215167079.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/37282642157.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ee675623---dugafujibebatefi.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/49365096539.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/godalinivarimalape.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/parezuje.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/88949571293.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/19692748426.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f56f81a7d---nujovet.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcf82c4cb---nirixokagelu.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/617409114.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/tigobipaniletuzenifiv.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/25963171861.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/kuxowomeveboduzaxu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a89ab50a00b25c0c604982c00d3139e6/tikuweranawawe.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/suxexi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161324f14af36f---78544067566.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/28266510315.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/50628589376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=can+i+change+my+gps+location+on+androidPDF 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_off0000b070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB070 14820 bytes
SHA-256: ea12f9b4a63d68c6a19d57d46e134cc75827fb4d7392779cb0e0e12714b9bb79
font_01_sfnt_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 11104 bytes
SHA-256: c84ae398264a7d45b8446a3850866a381a5990ad4307d59181331a1b6e61a218
font_02_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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