Malicious PDF — malware analysis report

Static analysis result for SHA-256 330a24261148da87…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 04:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4bc84b5e40433df4af31450a5386da22 SHA-1: d18a9205a7c8dd0f87993eb776067954b71aa19d SHA-256: 330a24261148da87758e31b86df11b7ae7ada1b1052f5137b1cc8a46f42d0a26
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a link farm pointing to various compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=graphing+linear+equations+pdf+worksheet PDF link annotation
    • https://ontech.vn/images/ckeditor/files/sadavifolujejirij.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/muf5f3ka03dookgp5vig0dtpt4/zagosewepile.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/13954b06439b6d8a903d687bbeb59794/muruvojibif.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/jazurenimeferavun.pdfIn PDF document text
    • https://stvorki.ru/files/file/famawupuzerer.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/d8f82u7mt3fjn27d3ui619dqic/tegonas.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4b4c8fa5dd4544f1755b992ba9644495/bumizonakumaja.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8acaf8fc5c---48372259511.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/bee68265352b46854954d8750c8cae39/1643258648.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/20157210607.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608591be363e3---74734991276.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/5895904575.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/gimavajanomutorixejizud.pdfIn PDF document text
    • http://wernitznigg.at/files/subelukimononutuzazepif.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc71170968---xetavewobulubexofuro.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/r98kq70umagmhnnravj6c6bph1/43002058184.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/81574493667.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/74679617695.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608289723a257---badujix.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/gomaromovozaxosewokenofa.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/af0bf05ad4ea4b8809090647c49cc52b/ribotazikuki.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/dts55e7hjgjfpthtu19dtater2/36531719362.pdfIn PDF document text
    • 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_off0000cee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 17180 bytes
SHA-256: ea27bf987dbe73ebdeeb0cbe1e26449ceeb9df168db2bae60cbe1c7274a14180
font_01_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11340 11240 bytes
SHA-256: 70248b8d358f1dff638750f2eee2f1652e6c4fbe7e8894af554a9c291d829ffe

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