Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4558f558d7db30…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 07:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8978d8c62399fec70f024e792c7786db SHA-1: 2ed1a5b7577b6d2e0e7325a66485edbd3500e03e SHA-256: 5e4558f558d7db30268ae8f8e6947751dc77008b218ffe8dae497ff5c020ee48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to directing users to further malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17080177c---20247502093.pdf In PDF document text
    • http://infinity-pro.ru/userfiles/file/82379051075.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160784f005c9c8---82204755490.pdfIn PDF document text
    • http://wenxuezj.com/images/File/samipemed.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27ca08c88ab4a945504df979eebd2da3/rakodopamowidutogoseva.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/rijoxejobosinazaxutata.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/bepex.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/78646017017.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/37400820827.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/63927918628.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vvt6ebbgf63o5r07870eul9i21/powojo.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/28257278881.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa0e7c34d---rewijifibu.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/pafojafirifomigikodewenu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67daa98f7a---powefisajesufej.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ebd0b83f12f3d532b5693267419339a3/62758552621.pdfIn PDF document text
    • https://telenovella-bg.com/files/xevof.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/93779020268.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/kulewibeburirebajur.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/eb6714c17f55a34a9ac30ee0f2cfa0e9/27821147678.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/839d7920fd17ea83a3ae0047f1692da7/vuvalezogujig.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/6659045373.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/sojivomizisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=r6+crossplay+release+datePDF 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_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 17892 bytes
SHA-256: ffe4c21026587449f2c7a8338c7c5e26654565e42bca8d6cbcb39b1acdde8d31
font_01_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 10636 bytes
SHA-256: 2b55c2928568aefbe7d9e685327d1fae2fb5ffcc2e26a15502e76af291e19967
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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