Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8b6d2fbbae75c5…

MALICIOUS

PDF

77.1 KB Created: 2021-08-26 14:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3d0840fea5a4be54a4a2b496243048f SHA-1: 3538356b9ee1d42bcf3a86c3a321c200e7d90af9 SHA-256: de8b6d2fbbae75c5077a7193ab87b69c7dc1b888fe39538eea510b8fc953ff43
164 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. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these external sites, which are probably used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://krisoc.ru/uplcv?utm_term=if+i+could+find+you+now+things+would+get+better+lyrics PDF link annotation
    • http://anhbanglaw.com/userfiles/file/70584593322.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/51467292781.pdfIn PDF document text
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/21475369243.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/nukoke.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/oo1gmknj57bdf9lcj9m7qbcmj4/66960612501.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/49a7724fd280377ef93736a52e888bdc/13195302052.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/cd9eb35a1c9fab4a8edd76195a8bad9a/12082377571.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fc6d250195168a397df6e662860e1091/92821024404.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609dccb5c0575---gotabosas.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/vomuvabawameradonugiveju.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed57b2bf4e---marur.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/65427008754.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/23128613906.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/japolilinegalotukup.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8e6ee15179a9555b6f6579e14fed0ccd/56375044849.pdfIn PDF document text
    • http://apvn.info/userfiles/file/warokemiv.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/67128754254.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/27921114768.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/9096200991.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/16537357321.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/80794805452.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/87761277550.pdfIn PDF document text
    • http://apcmagon.com/userfiles/80566105332.pdfIn PDF document text
    • http://balalajka.nu/media/94446859359.pdfIn PDF document text
    • http://parfumland.sk/upl/55581723524.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/7443272253.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_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 15856 bytes
SHA-256: b761c8b251be18db90e79c76cfbc0c095f3d288dfe3337bcc2d9a52ae8c819f1
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 10984 bytes
SHA-256: c30df413e1f916a973299418c5ac801f710218afe1d6658c8fce324a0df8e4c1

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