Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebee4a38de099b73…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 05:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8bb92eaaf1775497aa8892415d512eb SHA-1: 72a54f3e5eebb3dde6058bf09bb1b53674335f4d SHA-256: ebee4a38de099b73cdaf0bfb23f5dba97ab026a69564fd63f8fdcf9623c3a9c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c0583a6f300f32b2b83bf494339117df/25541972014.pdf In PDF document text
    • https://hoavily.com/uploads/files/67219140261.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c587935ecab---86936185430.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16070262497efb---dotagaginafavikiguwe.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6a9f25f1043fcf32948dba999f6aaddc/rorev.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/4dfjmnfkcl0r9r8a22n0dl13f0/97940661158.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/99680f329c498fa6e4db26c5f372562c/71704215128.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/14286840853.pdfIn PDF document text
    • https://aedwea.com/upload/foto/vigonidiresaz.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183cc8b2f06---55069243365.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d5fe9e43---78807144524.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4248043d---jujunon.pdfIn PDF document text
    • https://mbbs.hr/files/wusowanatugekolipemizo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160962c8b9f576---47142792150.pdfIn PDF document text
    • http://charivne.info/images/file/xorojibisun.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa01281e7b---migizotapikibuzenesutow.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/ditofozavexufinobib.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/vitofokipuwifuvumomitunud.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/pufadojobivu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96fe336ff---84262975229.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///21271597050.pdfIn PDF document text
    • https://lasanisports.com/files/44619862948.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/759cbc75ed2efb2221f5f6ecd4358f8f/71403398754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=measure+theory+for+dummies+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_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 18244 bytes
SHA-256: 53197704a1eadac4a59465030d38626abf45d5544a4c5229ec9c75773639be07
font_01_sfnt_off00012000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 10820 bytes
SHA-256: 83d24c7a6f08baa76649cc352219221931b6b3f31ef17eef177bc77bd30e2f54
font_02_sfnt_off00013907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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