Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7fd8d0c47edab6…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 08:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e13f1a0997bb0cff455f9d75e699a9b6 SHA-1: e890b4c6b7c957a7e38773f622de911756591c21 SHA-256: 7e7fd8d0c47edab69c9c6b99b7ea2bda4ed50c92e6b821163b81e865eb304cc4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, some of which are compromised WordPress uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The embedded JavaScript is likely used to facilitate the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tresonance.org/uploadfiles/26395912154.pdf In PDF document text
    • https://hk-delight.com/UploadFiles/file/41938734212.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/58086723677.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210907_8C891C23BE282ABE.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/88127740036.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/fagalibofudufapovavobozet.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/bepatibipegawudexewagudi.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40518676884.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/70521923143.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/94803721910.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16304587702100.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/57972272687.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/92595477388.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/fubireti.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/batixuzugekekib.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/xilipazetaveti.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/juvixuxuta.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/nafelifudibubaxu.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/kofogufu.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/puvamozigidufo.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/79298340194.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/26333607257.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135214f47f87---kopegipefopuxanav.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400d6991df4---71097147754.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7ccac8fc---moler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ppsspp+god+of+war+4+downloadPDF 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_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 16424 bytes
SHA-256: 9d6fc97a60dfc10e5e84a4ee36b4f157680adebcfc73a1a17366df71fe88df7e
font_02_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 10516 bytes
SHA-256: 9c02e75ab4d3db4ecd5071471854f88c7ab9f34067335ead7c8deadc84b8c934

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