Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa5befecfdbf57b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 00:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 059024d0d6e596eab4dbfc5af96a035b SHA-1: e10261a0e74a2ce0a272efc272cd4b30040d822a SHA-256: faa5befecfdbf57b21ea1727e8c5e7096230c41f308a4f5a98f2c0f90b5afa21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=beginners+step+by+step+coding+course+pdf PDF link annotation
    • https://pcetravel.com/files/file/56088113034.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5fa464f48---79707264545.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/tuwapaxuxananufoguwe.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1b7d8kijsi6dkkcc3inc9clti2/tajan.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/wejugixi.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210925204741_y61fw4.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1257b89c8---nabelazorewidijogir.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/95426705903.pdfIn PDF document text
    • http://pasted-radio.de/web/files/79843720496.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/kiwosuwaxogomefikovenigez.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/72774308067.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dda44a573---14561372883.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/73805839052.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/dixetaledife.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/jigefisabegemedoda.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/nuzirobafaxonajusitilel.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/78150651961.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/32901946342.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o4fqimlb62err0cs80pgutpj47/20512605272.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a20a1d3648---91968680596.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/mametipesokegele.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/zajanadorusisapimewezidu.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/9118002554.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/wokanubali.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_off0000b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 15740 bytes
SHA-256: 11b7322f4eba6ed93987785bfa45122b9712f3954cb813612ea0e9fade3caf54
font_02_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 10996 bytes
SHA-256: b7a5cceeed677fa7ed4eaa67abe53bdbbfd44bfe8b8f3b22c05afbce2bbaf460

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