Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ee3ebc16a0fc26…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 05:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 186cf4d2def36b45416576f99c77840d SHA-1: 83bc056a87a2be4d3ca48a42aaa24048abdf08cc SHA-256: 19ee3ebc16a0fc26aca5b54e168701f6338040ecfeb6ac92213dbf99d80823c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute phishing lures or malware. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bloomlight.pl/_bloom/file/76314772608.pdf In PDF document text
    • http://kitpaisal.com/mypicture/file/92990758304.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3da50958d9d3e733b2b8f11972b98989/timegunujofokiwot.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/81240278720.pdfIn PDF document text
    • http://platcometals.com/images/file/18563705388.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363cec1173d---66158497299.pdfIn PDF document text
    • https://wita.lt/images/files/5138322536.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3377c2ed21---64738723190.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2b20989f16ddb706cfb6b5268732f050/89763273543.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d582c7fcf9---misamumexulaxufopodobesab.pdfIn PDF document text
    • https://icbacademy.com/upload/files/20041602599.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a2af86899---buripo.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/49949732692.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/xulonofarenolugunusej.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c000b3848d4---puvalulolegejab.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/94042125406.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/xogexujetirowupurikaweki.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/417f66a16770cdc59180ea69b44f993a/21083696417.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788bbe86f5a---giwowanodudasoba.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/47044281663.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/rozepijabazinulimitarol.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f939930fe9---dedexiwotak.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/gumiduxemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lg+k20+manual+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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 17864 bytes
SHA-256: 0ee8c45861d491b3e17ac47210a995808c822f7ac1864c5b7251222e69fadd11
font_02_sfnt_off00011fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 10520 bytes
SHA-256: 0ad95e9ebdc2aa487b9509c3b9f17713cba19167ccb4a549d5aa6575e5c695bd

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