Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d13662a9c94dea…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 11:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c09955676e4271289e047609aeca4c72 SHA-1: 49ddce4f8bf7eac76554025815f0307cf10fd20d SHA-256: 18d13662a9c94dea4c55c79fcb0b2ec5ef0aa5cc55971de22e34de7f40fa64b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs that form a link farm, with several pointing to potentially compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://master-br.ru/img/file/8750483084.pdf In PDF document text
    • https://eobliecky.sk/userfiles/file/zimom.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/35533036160.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/tadisifep.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/pijetugejala.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/wabubijikutunavidexokibix.pdfIn PDF document text
    • http://dothi.info/images/files/56466443876.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kelokozamumogezi.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/lufajog.pdfIn PDF document text
    • http://scpt.it/userfiles/files/42449114318.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fe625def61bebca01ab43ffff701e4c9/51238046884.pdfIn PDF document text
    • http://babamoleskine.com/files/file/87265755802.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/revamasevugumimuxez.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/wevozofanoraj.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/56156030190.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/89617335965.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/c725e7979e42082dd32530d4d7da0568/36117761316.pdfIn PDF document text
    • http://wajl.net/img/file/202162431129.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607280f54af1f---45949955413.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/28166968962.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/79867284238.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/xugixixud.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607accd459c4e---17139055724.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/33e49c8ac28e63d601f792b3c003f2c6/70488990766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=signal+protocol+pdfPDF 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_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 17472 bytes
SHA-256: dd4ae456250fdc9c0e8af7cbd8b470eb4c3d74522d3eaa5433142a9589e8e610
font_02_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 10568 bytes
SHA-256: 7ed89ab6e4ec9565067c24a774c42a1b9eb0d27c97e9b3ef764151450c1f0d11

Open this report in the interactive analyzer, or submit your own file for analysis.