Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd4f4834d874ec7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 01:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5e460d2e8c9f683a4ef0ff76879038a SHA-1: 338d16dabf6e91f148fd97573d40976d74e8dde8 SHA-256: 1cd4f4834d874ec780cd94d5da02997ec0fe6897f4196396e2264f4deea13d28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=proceso+de+elaboracion+del+tequila+pdf PDF link annotation
    • http://wohntraumgmbh.at/2073189981.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/nujadev.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/kikonazabipoluzuxexujinu.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/28997639153.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/15828031561.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/75740920544.pdfIn PDF document text
    • http://vtaky.sk/media/file/8981266302.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/93701668125.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210911185142.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161357ee0d96a2---11214320099.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb8942a5fb---26073424476.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/96586007232.pdfIn PDF document text
    • https://people11people.com/uploads/File/10735997756.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/wexefokirunudulom.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/pimikugelol.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/rozibedem.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210920_105011.pdfIn PDF document text
    • http://classtool.info/upload/files/86176087710.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/tojorizununalalegakom.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432414b5459---mafaboxoxiguresobil.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/80351274537.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/34141182119.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/umn1usrhp755nlum4k0o3tj1h0/patejefefilabugesewabezi.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_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 19836 bytes
SHA-256: 9e8984855feaf1726bae7450a9d60f5aeedd088bf48db0754b6c5e6d801126a9
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 11000 bytes
SHA-256: 2e76049554d2647b82e0557a87d185aaf9063ba8f31bc7d8e85e7e87d03a1555