Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81642d0f4c14fe6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 12:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 966a80447680a6ce63d7cd7aabb27a97 SHA-1: e794f40810d6c45bfbb4a435d8a9a3125ffd1a73 SHA-256: c81642d0f4c14fe6077d898b091fd148ee61dbf15aaf6a09eca8959980151cde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, likely to distribute further malware or phishing content. While no scripts were directly extracted, the nature of the URLs and the PDF format suggest potential for embedded JavaScript or other exploit mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://usagimatur.com/files/others/86336474668.pdf In PDF document text
    • https://aneri12.cz/res/file/dexujan.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/50828115916.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/46626386429.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/70854699711.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/64109542724.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/wulisalubinikos.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/noxekedowubegu.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/lavuledire.pdfIn PDF document text
    • https://temahr.hr/files/zelalazexokixinunek.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/3210641496.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/wunimizajovage.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210905_191334_1315.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/50907677804.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ff19f849f90f8be02e3506ee09786567/fozigubedirefulumuzase.pdfIn PDF document text
    • http://dentherapia.hu/files/file/14527374908.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/aff6706041317dcce3efbc02364f5aa9/sixapovuwojok.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c0e9685b68e8a1c784cf300e64f02564/rudipi.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/zirinawixemuneves.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/xenutinekepapagitiwonuja.pdfIn PDF document text
    • https://emmaushuis.org/pages/bigofugokawigenisa.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/35387731326.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/jisutidevikiluvadidok.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/o3664cd9huikvon5nkv8iig8e0/ruwazegaxeduwegoze.pdfIn PDF document text
    • https://dental-essence.com/admin/userfiles/file/28696825429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=windows+download+on+chromebookPDF 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_off0000b672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB672 17076 bytes
SHA-256: e7524e44aef7abdfddfe4614a1b8873c4310efcc65e57aa9b9414d77aa5c182a
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 10848 bytes
SHA-256: be2f25c535d36ef5331a8d3b6607d6e4c2bb1dbcacbaf78d986ac648fe87fcfb
font_02_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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