Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9715faa3628139…

MALICIOUS

PDF

86.5 KB Created: 2021-08-13 18:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 462fe9ada8fa219ede2f312e4b41c28b SHA-1: e1e9707c274198e0939fcc2d37b2286af13db5ac SHA-256: 5b9715faa3628139390d6d054ef886908d62363368f03f53f8bcb30f7a21ff81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb4378615---44343127779.pdf In PDF document text
    • https://circolodelpistone.ch/userfiles/file/tolifasitosezixofikor.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/nixurevere.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/12886789915.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/7fc3dd3e5132c82d7c94b302024ef77c/4116484493.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d41be913325bffac6149f77f8588ced0/14994503443.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee03c6c0d7e---78285446591.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a378db115bc---bilabivevojezodidaves.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/70387228310.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pejaxebadetajatona.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/20063207774.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/07c851eb77278803845172edeb727a2a/xukobizu.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/24869701228.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9b7a1466---daviroxisoga.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/8fa3636af30095741866741af300f2aa/modijowukupakumuk.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/78391158924.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c3423dae3---lebukamikibano.pdfIn PDF document text
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/kobopinidizudorinukaveka.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/5sgeml53mlhh3ub22rna2dk681/bobibozepekovopomodesuvu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2766e60f---belez.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/93024855093.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/192dc8ad4ea67c2fc6ad1001323e1644/58704964975.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/vupevasenoked.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/vesufegekur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+calculate+the+theoretical+yield+of+magnesium+oxidePDF 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_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 16796 bytes
SHA-256: b47e4dbef009e4f1b66fda2d7550afe89a0325d713579e2ca770590efedf98be
font_01_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 11316 bytes
SHA-256: 4abbd6034418b5f0a9136dee6a6c01f4b69ad4c7d11ff424d5c5811ddb58eb6f
font_02_sfnt_off0001333d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1