Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd8699db7818098…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 05:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cde594d6776e2b2406e5bde9253bf2f SHA-1: 90b4457b0ba9ea5e58c8fb1541ac6122f4644f07 SHA-256: dbd8699db78180980fe8b7120ebfe051ca0eaaf19ae129aa219016314bd95675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The structure suggests a link farm designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://thongthien.vn/upload/files/xedozobutu.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bc01e8f272570ab3feb7d0e07941aa24/82718326187.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/96308067712.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/b190brjfengfmpd7hpb7j5do4m/14796520151.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/517112886.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/ferefuzedujemebovigi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cb3ecb31f7de1ff2c71e0f31efdfdf06/tuximalonanelewe.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/7d64539fbca1061f769a425e7c5478b5/94057459690.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0988d6b3---17534272561.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/siposexefafajulatobej.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/luxevugezawejesubujijefu.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/xetumufabus.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/wawokupifipul.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a272d855303---46240804445.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/borupizalesatekebedo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be283c3c4c5---78099870987.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/43777782133.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081641404af0---dilurigewogulotademipen.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/tojipukomi.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/59287671620.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf08b075a9---liwidujedozoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=standard+proctor+compaction+test+lab+report+pdfPDF 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_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 18152 bytes
SHA-256: 0f239bf8cffbd2fd2474885e92ccfc1b4c81d24f8093e1afba120089755748b6
font_01_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 10996 bytes
SHA-256: 1228caaa17fd7e0dce5f8739c28dd128be7f8144d705d8083f7ee32a70e44bc6
font_02_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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