Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9657a5aeaccf5e…

MALICIOUS

PDF

81.2 KB Created: 2021-08-09 11:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b0164729062b5b8cae7704de5c048c85 SHA-1: b2087d9e3f7abca238cf71390c5590c45178c364 SHA-256: 9e9657a5aeaccf5e6f038f993892961cce59d42c7f05788c00060682981d088a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting and compromised CMS uploads, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns align with techniques used to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ketchas.ru/uplcv?utm_term=proportion+word+problems+worksheet+with+answers+pdf PDF link annotation
    • http://antoniolescio.net/userfiles/files/zurajod.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/fuxorirojovivojaje.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/41722920071.pdfIn PDF document text
    • http://elm3rad.comfile/juzuwadadozaserenobulosel.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/11197920789.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/puxiburidojetalojapi.pdfIn PDF document text
    • http://teakdeck.pl/files/file/xofawozadepep.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/jemavasavole.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/73980c4eeb31ba10d5e4caf219f4691d/bugufoza.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/24955255963.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/64341451771.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609422d8b60ca---divesufezeredazejuwapupot.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/45666439443.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/68988099707.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/gazegenujabejimedawas.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b7ce915d63780e4b8566c94b67e96c67/jolipokukonulifaloxemij.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/o3u79ftbo0m6pslghbtkc8r3jt/rerevuparapozudesizutefi.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/87774236882.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/46837943945.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/webixot.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607894ec7e733---5095915566.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/63593822240.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_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 11084 bytes
SHA-256: baf2924b201c95944843ac0b1f090f58409ffa77ed4fb127943fc91ee0d2daa5
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 18188 bytes
SHA-256: 6ce120f808762c592f8ebe17d54eed3021772b3d03eebaaecdae4fdc46e99a18
font_02_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1