Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bb73df6ea58470…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 01:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d145462071c1ccf8103c1fa6ab65521c SHA-1: 59137b62c9e4b598f10f04fd598b5a800955b00d SHA-256: 94bb73df6ea58470d494d61eae2c99b401af78569ad3163559bb6d938b0992b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, indicating an attempt to execute code. The file also includes numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to these compromised URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161538fd156a7c---dunimi.pdf In PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/58627775301.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/82234816431.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/60097078766.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/84785266462.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210916093423_ybuj27.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/rixumozadamutunego.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/61707f74c055391b6dd9061866d68d72/xevuwugibugodixe.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/wefezivisixofim.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/89984517604.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/nuxosigediw.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/19450173543.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/46433065406.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/vetuvo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7eb730078---75135331847.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/46692032778.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/tugutebedisugos.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/rokisanoxukore.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/jenofineruzomunozej.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210924050129.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/36111493439.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/xomamuzezurezezexuke.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/102130563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+wondrous+life+of+oscar+wao+pdfPDF 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_off0000af53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF53 15896 bytes
SHA-256: 5e999922ac4c9781f86082cf74565ef44a5393d96b0a6f91096c1fd78c60b175
font_01_sfnt_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 10768 bytes
SHA-256: 5237d7a42fe8785304c5c2f011c7de2b3ff1a378b1f45c01e1c3ebfa4dec61cf
font_02_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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