Malicious PDF — malware analysis report

Static analysis result for SHA-256 b890f434f41522a5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 13:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a5baf04ed2f71b0bcbec39572b89b8c7 SHA-1: 6a5ab59daff07f525f223e7209975c560a5622d1 SHA-256: b890f434f41522a5e0dbbf842b265e19a7b39932e4eb98f85761f0bfa040891b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains a large number of external URIs and links to disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=developer+options+to+make+android+faster PDF link annotation
    • http://digivideos.net/ckfinder/userfiles/files/kijubedupepad.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/nirus.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/36712103355.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/23730840816.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/musabiturire.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/99296011474.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/45039452298.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/16055741156.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/xixemoganupopaj.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109030212037469.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161440c81143ad---dutepiveruxadedulira.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/17885652769.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ve943rc74622mbhnq5qdaol397/buxofa.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/36973404318.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/sotufilogikegezun.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/sororeravulezasaxivop.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613239756bf82---35006994595.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/gomuxo.pdfIn PDF document text
    • http://roberthalasz.eu/uploads/file/42412437358.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bdc5abc17d201029a8351d548e133d9b/75387637113.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/ranozuwuwudewotuwuwe.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/wajidojegirosajexuvivibu.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210914033239.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_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 10820 bytes
SHA-256: 1707ab4b3a17ad0e753ee6295b4ffc825b5cbf40fd6956553fbd9e117d9e5967
font_02_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 17532 bytes
SHA-256: c8de7508c30ea5cee9ee81f619fcf40f163385ff8f1c4a2db2727afe90d170c6

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