Malicious PDF — malware analysis report

Static analysis result for SHA-256 461ad24f16ecaa57…

MALICIOUS

PDF

91.3 KB Created: 2021-09-10 16:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5a6c7ed0e01959e3c9624f218eec775 SHA-1: 84729ea532236e04f4722fda150f71d690970265 SHA-256: 461ad24f16ecaa57d1d9cab762fec6cfc24baed6d168c976f6ea282ddcb643fc
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious and exhibits characteristics of a credential harvesting lure, specifically targeting multi-factor authentication or one-time codes. It contains numerous links to external sites, many of which appear to be hosted on compromised or disposable domains, suggesting an attempt to redirect users to phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a link farm strategy for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://archism.ru/uplcv?utm_term=otp+authentication+android PDF link annotation
    • http://harchovyk.com/userfiles/file/94423514761.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/xadogipexigesuzasazojedo.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/80220702977.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/18361068357.pdfIn PDF document text
    • https://mfdesign.hu/files/file/26395295233.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/suvixinigaribox.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/499f2f699b2ed2e7244a9fe6938ce870/sokuwemaxopamuvedokizafe.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/kevajurerazomopiki.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109010924081434.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7cd1796e---52931844114.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613562ec7e736---14339732976.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/ximuwusexi.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/budofuduvixorixixupuz.pdfIn PDF document text
    • https://birotex.rs/images/files/49237088315.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/rerovupojipisumubijorari.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/jetek.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/rijizavan.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/nokoxufevewubo.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/kotuvivu.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210905_BE9FE4004D03CF89.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/xexawapasikemif.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/8b081a363895e08e9b0fd6135bdb5888/24243209577.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330cbe8f25c---pinadivanebunaj.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/lurixegol.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210903_6C09183F7AE9EE43.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adbb017698---69325207499.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/demizesewu.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_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 18336 bytes
SHA-256: ddd538d9e11ef356f7f82054b69f535321a4025e065fcad3e7e630627fcb33d3
font_01_sfnt_off00012f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F47 10520 bytes
SHA-256: 43ecad2b0cf9986bdf611df4fc3e37e7b8a4d572549a9f7a49b655274145a578
font_02_sfnt_off00014735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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