Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccfe3f1e15a41ea…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 01:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f1cc9467b56cd2e48de4c70eb36c314 SHA-1: 8535bd077e03cf323da1250d3c8ef3f3801cfcce SHA-256: 6ccfe3f1e15a41ea5b39d5276ab8deead81cb906aadfe8f0e2a81b6d71dadd14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains. The presence of embedded JavaScript, although not directly analyzed for malicious intent in this report, is a common vector for exploitation in PDF documents. The heuristics indicate a focus on creating a link farm on disposable or compromised hosting, suggesting an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kunbot.com/upload/files/benapeg.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f550e82a55d666e3d873ae4a1abb7a19/turukezezivurunevi.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/49074685314.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/bifozo.pdfIn PDF document text
    • http://honda-vo.com/upload/file/xafijukososorowonew.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/27314861549.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16139db74c26af---nuguxalagiwu.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/85365227967.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/gofosepijixoda.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/rivefuxefuzobesilavebi.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/16154654881.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/46948025766.pdfIn PDF document text
    • http://hexindechem.com/upload/files/kowawolite.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/pimojotikodij.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c6ead7b824c1ca48804827c005b90bd0/56140857038.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/sesetekonawolemogol.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9nil9b8vqtkhs6m3rlslh84hcp/setixaligula.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/7151735651.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/fopor.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/lizesetavipabimigor.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/48032750414.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/jadeka.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/30620901983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+22+dbzPDF 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_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 9936 bytes
SHA-256: 58aac3be833b5988ac285340c198a773bada3f3152480423fa77f56af1cb7138
font_01_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 19620 bytes
SHA-256: 4ec00f964865439bd5eecc672a032b539a967e5adb017e142d81e434ba30e53f

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