Malicious PDF — malware analysis report

Static analysis result for SHA-256 1374502976beeb99…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 06:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f2ae223f19ab5f602ffd0dc55f15da3 SHA-1: 3a053d2413db0384d85ce4ef08b55f8865663f50 SHA-256: 1374502976beeb997d908aa9c22abfd675412250c35607b5c61460dcb074c571
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coolinterier.sk/upload/files/kokapuwu.pdf In PDF document text
    • http://casaatlantida.com/userfiles/file///vogemodibive.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134face548ad---vikakexekefifex.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/25645042841.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/dotumaguf.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210912/file/bomelevarujura.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613156d575cba---jumuwetafanile.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/raduwasujagujig.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/lilawezaludur.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/sekule.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/majigeluwenadekiferan.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210902054413.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/pagerofogike.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/10935313616.pdfIn PDF document text
    • http://beijingteye.com/upload/files/7764948107.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/55290239544.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7764495ddd1e73010d7bc055caaaa6c0/94841768593.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/doligopodulibib.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/podiwinivev.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/sudosoxawadoloduremo.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/rifomuraxewapowedu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/luvamikoranutajomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+file+are+text+messages+stored+on+androidPDF 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_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 18368 bytes
SHA-256: cdb34be3be1dd8b356c94d3fee546fdaa230029e7575204686c5ad79e575f918
font_02_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 10896 bytes
SHA-256: c0668d68edbeac8f2e5667abf6e0d12779e7fc42a1630fc7f38f93304c8b0c65

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