Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a00d6a659859323…

MALICIOUS

PDF

71.9 KB Created: 2021-09-07 04:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2e8e6b72e7675f27e7740f537dc66de SHA-1: 12470d0493f01efcdcc8da30bedf8b82b73d5c8e SHA-256: 0a00d6a6598593235f664cf4148c9e972fc40f1033daa20f47ad28db3b3e0515
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

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 http://szentistvanpatika.hu/upload/file/xinitapelavesojojifiwir.pdf In PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5bba2a3c3308b52f5c72fe637396e9fc/8883819761.pdfIn PDF document text
    • http://mylodge-naoshima.com/xamebixikokotegupo.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/xabamozafivukesawegojil.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a242ed5fb9---wasumerexokiribotewi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8730c3224---61357719157.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/40412425880.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d985d6cc1a---96995375803.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/dokopej.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/jijer.pdfIn PDF document text
    • https://irrisyst.eu/files/file/20203354040.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca06849ae5---dusojomabidivawixemukunu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/df6t3tsna9un81lbl2rmafql4e/30785287195.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f519a5ba94---76637697937.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/rujunuravuvubuveradori.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/90179843352.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/paloxawinisosinigewe.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/84734260500.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sikaso.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-9/20210509120421772064.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/13264510783.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/84101175265.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/65241840268.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430063606651253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=normal+distribution+worksheetPDF 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_off0000b88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88D 10908 bytes
SHA-256: 7a676c0c93b5317e22dde9a89abbe174b72d0b2cdbe95a020fc00e9a905c9951
font_01_sfnt_off0000d1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 15812 bytes
SHA-256: f52175036ad8c618e438ee1be12b970dfddde89a5d91c63c34d369b1dd128469

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