Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e329efd4561990…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 08:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ddae96d9abbc367de31b31ec85572b5 SHA-1: 973b6b01dba7e8065ba232d4d2af556153a229a4 SHA-256: a4e329efd45619904baa6473ad3c57c2ee7d4491903bf5356769c6d2b3532589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs hosted on compromised CMS uploads and disposable domains, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=new+building+materials+pdf PDF link annotation
    • http://etoprosto.ru/ckfinder/userfiles/files/xewixona.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/nagazusebele.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa3795a80a---mubujusunepajijefapewis.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a656c1ca259---waxetobaka.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/93131196856.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/95iump9276pg9qp0vkkbe93q0r/tufubuliw.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/3rd5b04lbk9a1ra6s9847uadq2/64713512293.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/94403664889.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/57986826529.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/22659900543.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/19605e29096e49c0f48ea63a22196ac4/86814389262.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/95935832548.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/17620928730.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db195783dda---wixovuwetugorebabawano.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4s0i4685dv8lj0uu831r33t5rg/92021234538.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/lomek.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/31876462446.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a06cf44db9f---77873992513.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/59771948557.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poniwobifimomesowuxela.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/df3dcc4473d3b64543b5b75014fddd88/kufakojena.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/61177448837.pdfIn PDF document text
    • http://edgecs.net/documents/tolimefunijitagojetixuj.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/62800923673.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_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 11024 bytes
SHA-256: e8bf2eefaad88abcf1685d142bc672ac30a038955b708ba7dc1b875d1775e09b
font_01_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 19504 bytes
SHA-256: d2e1e5e3463be366d16c6b7cdb879a543d5e400f773403df5cc58a09cbc655da
font_02_sfnt_off00013179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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