Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c1bd1948200a04…

MALICIOUS

PDF

93.4 KB Created: 2021-09-13 01:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: efcff7fd7e0afaa867cc2a205697d50a SHA-1: 80a0eba88c2803abc9aa617835f6d44ccf7a0b27 SHA-256: c6c1bd1948200a044b0a129b7c28e5f7ff0f539c9d04a80ff106d3dedd1fa9ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised WordPress uploads and other domains, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79840d3af---68032142507.pdf In PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadivesewino.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/23603008312.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/64605893323.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/dixab.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/dakala.pdfIn PDF document text
    • https://titishop.co/upload/files/19769127124.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109052245231745.pdfIn PDF document text
    • http://101balkon.ru/upload/files/92080148143.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/96249708601.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fb4c26a73cff8447fd758e1cb7ecbb94/13219187496.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/95039539615.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/83076598282.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/junudejarozitimawud.pdfIn PDF document text
    • http://pasted-radio.de/web/files/nurizurepogatupome.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7e4c922f---tukefotijerujawelo.pdfIn PDF document text
    • http://metall-press.ru/files/nizorisamosaga.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/fewezuxogekekepupuxele.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/54739879868.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/77367017521.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/542c5ed9a3fe5ba86cf577d99e4b4c12/61044283479.pdfIn PDF document text
    • https://rosycaffe.com/file/34301444115.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210904131221480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+free+robux+real+2021PDF 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_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 19260 bytes
SHA-256: 239db28ae28385fa05642891975d35753b0f3b1e7ac9839ad1347b218c519e57
font_01_sfnt_off000136da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DA 10740 bytes
SHA-256: 1bad6c83634eca83bd1bd4f2f2dffe4abd1a6ce0321d6cd166c612039ffeb4fa
font_02_sfnt_off00014fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1