Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9e0fbd394d40c0…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 21:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efe1d266198f57aea04d4e1748a91e4b SHA-1: 1757885acc138626a40ccabdb7cd657c400bf17e SHA-256: af9e0fbd394d40c0d2db129b49353fe3e556dc2e423be3f462e4b17d2568cf0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, many of which point to compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=micro+combustion+pdf PDF link annotation
    • http://e-sportis.com/images/upload/jenopadatuzedinotarofufek.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/23252360463.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/misejunegulofa.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/37917386124.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/54073758306.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/92866060081.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a3ccde5d4---nubepasusovenexagab.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1611872c82580f---85843237099.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/kaluzowuvumixaredix.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/mapotojisavamobifobejigaz.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/jifotejubodukifatepat.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/78095949564.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2ea7f28d05f1055c897773446ef81e61/88543512802.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/90610930159.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9848489c64---29068158760.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/48520019348.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/52667538055.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/74997150562.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1cb426f10---58713891140.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/kazazezuradaxovem.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/gitisivilo.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/wuxatewikavisobos.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_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 17720 bytes
SHA-256: 98dc13871f80961f2900da74bf3e69e9a1bc6defce2231d8284d8d4e39b44e09
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10676 bytes
SHA-256: 674d2f11072d4c689430f20913e26eb43d4da63259233a02ab765c5371adada0
font_02_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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