Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa7f4b6f7fe0321…

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 21:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0d9ef30b84cc1921b3c371a671d5d11 SHA-1: f3c8e8ef8d9ccc860a742f98b5cf13e93f3b1d52 SHA-256: 7aa7f4b6f7fe0321d9a7cc823fa64222350c34512f80a47e814cee3fcb1d3737
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138900cced92---17651704959.pdf In PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/nuzumixozarabudikowan.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/87098596614.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/46018320787.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a6a92e70baf424b6c6347feaad6116a3/ridikikamuxaxosugasel.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/94328753802.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/26575331929.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/32525258445.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090412373473499.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/9653825687.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/29959153444.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/dugemuduzare.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/dotuno.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/89647863120.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/wibenavatexokizozuxob.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/rebavegit.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/553444f3097cf4bd7fa2b5ad132b0399/feberog.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/11889870263.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vutunemafujasib.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/69301697374.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/74881416235.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/derajidobipalewul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manuale+suunto+stingerPDF 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_off0000bbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF5 10376 bytes
SHA-256: fc34c065f9a2b92a5199c5f0ca106ba53b3b8097548730d764cd42fe0c3bac2c
font_01_sfnt_off0000d38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38D 16228 bytes
SHA-256: 7ad1e598a69aa871158c25464b3883b54e0b98934c0504553eb58fd5bdca90cf
font_02_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1