Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed8b9243d0234eb…

MALICIOUS

PDF

99.3 KB Created: 2021-09-04 09:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77b98d16a99cf777fe398a7af00347a1 SHA-1: 81dbc795b01e25b16a833d3a431a1f75f8a01b27 SHA-256: 6ed8b9243d0234ebba77b0fd4282077d7f05a499b41e70149a0ed472ecbfca60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6j7a35n06d0r39qquc13rh4bor/94884875743.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/24778728597.pdfIn PDF document text
    • https://pindimana.in/uploads/file/1260501433.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d635014d1a---23823001076.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc585d0a0---99845780209.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f9e0d5fad3a4aa73f5f9ed7fe40c4865/nusujodexopovinikab.pdfIn PDF document text
    • http://wajl.net/img/file/2021817383.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/raxesezaropevisamajemu.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e6a97890c---51751127807.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d716275bc---memoxinuboginopatulozen.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/mokuxikexiwuxuwewefad.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160802a4f444fc---46953440690.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/gukogi.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/45041378032.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608068b3c2464---60836321259.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d333c4dd---31713646229.pdfIn PDF document text
    • https://network-italia.it/file/favijibolokufogeju.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1c76f3fd0f9c59c4471592c8c11b7679/72033868331.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/96754352080.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/531f5e4c09fbddacec4a4254a571ed0a/nivadogovunixamudupoba.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9861b4fc8---xazufij.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/figojozobu.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/49995272202.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aee2af95b---49644281056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gabriel%27s+oboe+guitar+tab+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_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 10884 bytes
SHA-256: 63c6946a8e3df62846c952bccc604b951c49c13a45b1c19e3f9adf6f5b796ff4
font_01_sfnt_off000134e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFB 19076 bytes
SHA-256: 1d2cef80e4cca60593fd3b67d609d845208d2c6d56d772795aefcc9b87e3fc4d

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