Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d693b6fd8a6961…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 16:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdd39ade514f3356d07b24b45e4c6e3c SHA-1: be3f2d5432ac7b3d8df6fa959554a91e673b4127 SHA-256: 33d693b6fd8a69613c528b45de49ec8499208e0b37d2b6b3c1495633bf30444d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to various domains, some of which appear to be compromised WordPress uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=the+great+gatsby+chapter+1+reading+guide+answers PDF link annotation
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/28088280861.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/gosofi.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/telizinifap.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/767b0e56e62bc2f82ae3b0d810461016/52629742554.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/12889793276.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/45183949442.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/68642467260.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/mejadogesivikuxituzi.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210716134503.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/jifufevuvezubadanig.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6f9960a7---69821243293.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/18089228338.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/gudeze.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116156500210---binonifumovedabomezemovi.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/fajogodib.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df96ee07543---navameleziwofojiwubuxesa.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b56b2a25e9---vugegaxivarobulo.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/zebutizutabewemanoregena.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/vevogesimi.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/20895691393.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a24fcfbeb35---mitamomule.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vakitobila.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/37194449079.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/68e789f6264c2bec2a5b76384ded1b0b/kisejexefan.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/68381433325.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_off0000c6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 11084 bytes
SHA-256: ef752bcbb9103c64592b3beaa84dfbb891053822d5bc012f3d10c66f0b4df8d3
font_01_sfnt_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 16780 bytes
SHA-256: 662ba77ecf9ba1490f7a95107fdf763db518afc98d5ebd4802db99a15f89ade6
font_02_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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