Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a99f585ecfa28aa…

MALICIOUS

PDF

98.9 KB Created: 2021-09-04 15:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83fc1aa53ee6c5992ddf16acc8437c8f SHA-1: fddbd7f7f12cb7e6c5b32a64df5e81739b5e905d SHA-256: 8a99f585ecfa28aa755a7998bdb2c807336cce39a5f80413bc7858df3c867404
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to potentially compromised websites or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates links to compromised WordPress upload storage, suggesting an attempt to host malicious content or phish users. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://bestcoloringpages.com/userfiles/file/1688749139.pdf In PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/dutenujiweb.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/rikojofekewepobijipev.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ja3lsvh967mg9311nsc2g317n7/19183053135.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5e31e1e8---51946255914.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210805050830.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/pazubuzelezab.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/86513336430.pdfIn PDF document text
    • http://digifast.cz/userfiles/1992093119.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a0d246d8d---72855132386.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/79616569604.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/dufejifazoregumabeboxewe.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/giwumanolivumupe.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/31684374481.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c59a6eacf4---34113538337.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160729226c1d3b---keterojibibotafadozuwoje.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120fea02cc8a---81935322037.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/v3gfqdrikh92490br452hna0k1/dowumufiwidanibumeliv.pdfIn PDF document text
    • http://fedoro.ru/upload/file/92771379555.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dc8234b8bc92b048baa073269f474c00/tobuk.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/misikikujinefaxozozovemu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b56c6d72---wuvunipifolejudajogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chi+nei+tsang+iii+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_off00011e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 18588 bytes
SHA-256: ddbb94b68d5222289be4434244a3a603c903a662026ab50f232e2b5fdbf522c2
font_02_sfnt_off000166dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166DD 10544 bytes
SHA-256: a62de5502676170d3a6269fe03ba9a8ec0f3c3d4c49b3be64ab80bbe06d590e8

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