Malicious PDF — malware analysis report

Static analysis result for SHA-256 e461040013c6ef10…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 07:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a47716479dcc61093145555f193e7f9 SHA-1: 89a30aad9df644fd75199f8f6d3ecde0a2ebb145 SHA-256: e461040013c6ef106fe152f2af63ad42c51f33d15d35c83245c46866432d690a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the PDF structure indicate it's likely used as a lure for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=multinomial+distribution+pdf+matlab PDF link annotation
    • http://comitatoamiantovelodromo.org/userfiles/file/46354804785.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7941135f94f3da740f78a24e6611e286/kinewiralokowumozewazebuz.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/95553766050.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/87951210639.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/90816937237.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d07e140a---kujibojekolulimaziz.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/34213536112.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210624102916.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/29491259734.pdfIn PDF document text
    • http://valeneighbors.com/userimages/todenajonabodoxe.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcb91eb3b9---badinap.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/73395469578.pdfIn PDF document text
    • https://lemanssrl.it/file/pisaroluxiladumilu.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/teligosedezuzofovi.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/79877301544.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/39667336624.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/7881037368.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/dibejebikufabi.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/xizunibazowitosikixixova.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/xetaza.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f1a87b8a2a68bc3c091f045bc87623cf/48185179212.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca495470d8---734994158.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/xojasofeborufolog.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/53846714915.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_off0000c32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 10760 bytes
SHA-256: e974cf28ee44e2f9f8df8d31a889ea03e319c2ad2d8b5482dcdbcfef06299fa6
font_02_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 18016 bytes
SHA-256: 598005be9c829f375bdefee5c8c2b997d6a20e8e4ae4ca734352778185613039

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