Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9448887d032761c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 22:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c1546bae8cb0de1d726a8e24e9c20687 SHA-1: d7c0c25e13f48a9b57439f758152ee09a956fdb0 SHA-256: e9448887d032761ca5b27afad15d17701581d7eb8aa55747a198e86a5a536892
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=how+to+print+encrypted+pdf PDF link annotation
    • http://104408017.linker.tw/files/linulutobowasagedusebefo.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/50701232360.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/deb2774e6ded66018e2a0e21fb5f220d/39850813510.pdfIn PDF document text
    • https://htchninc.com/d/files/87985361368.pdfIn PDF document text
    • http://apvn.info/userfiles/file/vogojidodegibix.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bada668409b59e4055cb53c8e27b4786/xowadavoxoramojaxenub.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/76368493145.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/dizewizomoneneperuxeg.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb6246aaa5---63388990105.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141738c8d52d---zosuwewabajasufosed.pdfIn PDF document text
    • https://aneri12.cz/res/file/42062535550.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e9ed58702---64464958250.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/jedolelitutob.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/zewawobalew.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/27992998219.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zabojarurebereletil.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/90535108.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161345b0a48374---26380112622.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/42997824822.pdfIn PDF document text
    • http://chipgene.com/image/files/20210919_233343.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/15827479417.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/91917482761.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/48417632236.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_off0000b5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD2 10428 bytes
SHA-256: 2bd1f3e9806e0c08a6191e1ba0ac614b760ac1e30f6899f8c42bbd83cea1a665
font_02_sfnt_off0000e591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 17220 bytes
SHA-256: 4ea70adbcf5b126c8b11ca866e906fbbc8d1f2f6db62f3730cf8a919985172fe

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