Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bdb6fefde27b3f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 22:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9df2c30b5f7171042b6ee8baf28ce405 SHA-1: 2a6b32cbd9780c5af2a5b21c7433da75fdbdfdba SHA-256: 73bdb6fefde27b3f1d4b813d1796fd8375004cf12dfc6fef39f1ae6fcefbe006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and others to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The `wkhtmltopdf` authoring application and the nature of the URLs indicate a likely attempt to disguise malicious links within seemingly legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=tenses+review+exercises+with+answers+pdf PDF link annotation
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf458981c1---32798405055.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/4100908425.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/rumijavuworep.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/84575099343.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/54318512032.pdfIn PDF document text
    • https://medtek.vn/storage/file/nevojipagevodu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c113e8acf9---3806608936.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/varez.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/zefatazowutamasemoriw.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/94998467555.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9820e905fd---zajevorasarofos.pdfIn PDF document text
    • http://uci.ir/userfiles/file/dezaxibewe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6b5e227a500030c3e76f737783edd683/botuvedafem.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1053753bcfad906d0a8b0d36adb889ff/45816272348.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/vifikipixolizumekasefati.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f67ce3f867a76f8fbdc545f5a4c2c320/57551405682.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/10259990608.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/gajijabu.pdfIn PDF document text
    • https://hgb.se/filer/file/wetivapunugunoxebabowivu.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/joxuzax.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608268f679565---wiruleranebedutizone.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/17320930086.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_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 10768 bytes
SHA-256: 63b58abeebca7577e1762c3d59c28f2e67178d13aad6b6201f37abfe73847362
font_02_sfnt_off000112a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 19208 bytes
SHA-256: d9f87c5c60addaa27a60a46ae37814e709363e91863982f42c1a143e1eca9cbe

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