Malicious PDF — malware analysis report

Static analysis result for SHA-256 717bd71ad3774ac0…

MALICIOUS

PDF

86.7 KB Created: 2021-08-11 06:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c7d24d51b521e868b714650d9adffa38 SHA-1: e2d639021e26e901af004f487d36683f5603a47f SHA-256: 717bd71ad3774ac0e29b3aefd0ed3e763c6a1971f4fa969bcfe2fda611a14129
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://travelsafeway.com/userfiles/file/dafatetorutasopawuxijumar.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a35ba455c---sudelisasefarawuvija.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/gokuximodemegor.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/kemanavevejenusativejoku.pdfIn PDF document text
    • https://posh.hr/files/88114447232.pdfIn PDF document text
    • https://deepex.hu/hirek/files/rasumadotetibuwusutun.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/37bbb3b6caf11472c7c5cbed0c8387ff/4009523051.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8efdfc1a0a---verifolitux.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f79741a74f---xokalefodelumowuxar.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608438e38b5f5---kumopukinej.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b25c229809854e4cb069c2cc90df8d56/sefezumoferakigom.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd14e77781---87931608569.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7efa1f25b9---rutavofapuxusutebivosexo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee395bef462---95097182822.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/jebezevuvejofowaru.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/90588058678.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/belelilu.pdfIn PDF document text
    • https://roc.mn/uploads/files/93764779498.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e84c80b165e52e5198aff0fe25b7f281/54609798634.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/rabegosuzodewedesu.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/nafebulipomododowowiruka.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1f49ec71---zezibureliloguruguje.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/19489540147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+alpha+sapphire+gba+rom+downloadPDF link annotation
    • 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_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 17400 bytes
SHA-256: 9bfec39e37223693c835bd6375b8a3263eca43377aaa588c5b344251131523fb
font_01_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 11060 bytes
SHA-256: 36951ebcee61fb25b338b23f0af5093ffc4572116913df2feecd55161abd5020
font_02_sfnt_off000133c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1