Malicious PDF — malware analysis report

Static analysis result for SHA-256 725d9f010c5f2767…

MALICIOUS

PDF

84.6 KB Created: 2021-10-05 06:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8afd38cbd03133d0ac4f272eb324faf6 SHA-1: 3e3d0bda957c725b7055bc64402d57927a3abcbd SHA-256: 725d9f010c5f276752c4c706b48d4a293ce41e3009b3a8ea1b140eeff97c936c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and disposable hosting. This suggests an attempt to lure users to malicious content, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/87481708418.pdf In PDF document text
    • https://ajansnigde.com/resimler/files/zavidozonazilopegolajibes.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6bde517b5cfd28c7158c98318550e064/vawanibotenodegukefuwo.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/65733510995.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/sogud.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8da6591e5---54964468116.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/39324314786.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/wolubigonevojowepune.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/lidosoke.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/zamixebetifekutovojunuzew.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/19197569737.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/49719712717.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/vepifu.pdfIn PDF document text
    • http://airmon.hu/images/files/wewoxugokedutumix.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021092823435392.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/50850856667.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8vgvm4q0lb6456bgrkfkhise0i/33171156277.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/97481337081.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/99953080021.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/18213861301.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae47efc40---rujedefa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146959868c85---lonapapebixesudaxe.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/vavazotades.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/27763544838.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bede71195---zuruzetamerageb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=author+of+the+martianPDF 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_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 18040 bytes
SHA-256: d8a822e5d6f407e63bc13abe3657d9760702ab840c220d872de1677e85ba9cd1
font_01_sfnt_off000115ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EA 10348 bytes
SHA-256: bb6895cf3d27b21724d6f25f8d9affd7f16b7d11c736f253d035b59a281de245
font_02_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1