Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2d39167d5e8b69…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 12:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67a4fb136dbaa32cdda6cf652d9f9a0f SHA-1: 213675d5cf6db62eac4ad763e7d773fa246a9194 SHA-256: 5f2d39167d5e8b694ba0ed374e7bedae99ed73adbf706022cc636530b9396ce1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the link farm heuristics indicate a likely spearphishing attachment used to lure victims to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.fangjin.org/ckfinder/userfiles/files/gelekugobusowibiwijakeze.pdf In PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/47d89fce952a777494843b78957655b1/77352899165.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/91117420120.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/litiziruzo.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/jolokavisi.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/63866684354.pdfIn PDF document text
    • http://schokobrunnen.com/idata/munazezazoli.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74b55dc457---58099576187.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/21508936769.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611cec66505ee---rufijufava.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/fuvokesixa.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/batinopakonosopumani.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/hkva2hce8knllc4q029851is4n/81262698116.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/93235c51d8a05e1778681b41e5f6dce1.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kegugetareriguwabufu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4f4afae4---lobuvawufuvebodovesa.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d268d175430b56ce48a3607b45296199/33743727241.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160872cc8eca1a---29290573326.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083598ecef06---75263086763.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/47655440323.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/87116135008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=carrier+infinity+control+thermostat+manualPDF 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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 17204 bytes
SHA-256: 91db7883de8b1baa20e77bf88a8b7a3c3d6f2637e90ef0337a8bcc442545611e
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 10848 bytes
SHA-256: 872da2762100c01fb05b1dfce9ca227a61154f25752932ac1db68ae4475494d9

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