Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ca4d9a495c61d0…

MALICIOUS

PDF

92.9 KB Created: 2021-09-08 00:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83a991a22ff9684d76a44b2ef0b1b590 SHA-1: 47eef7ddd64be35d0a9a94cb5a04ee70d5bead2e SHA-256: d9ca4d9a495c61d0b456663b24f902c6f83e7b6a3b5c1d7b32109de10c9a1449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7322d27084509039a34ccfad0dde76d5/vidorekudolepuwuvugu.pdf In PDF document text
    • https://sanipacific.com/attachment/file/duxaxeko.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/e9tttm2oqvh2b39ild2u18qjb4/8211942504.pdfIn PDF document text
    • https://ibextrail.com/editor-images/lisoneneduwudado.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609104f798927---1812983333.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/68415100242.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd3c2d3825---zegazekelu.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/vatukotuzobolegavawe.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/wolob.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ce18d01509838f98282bfcdb9c8e7eb2/71923803395.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0ba981388bc4c64a7435180f78868346/kogepul.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/1559945265.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/mupojirafi.pdfIn PDF document text
    • http://ruresept.ru/files/file/wezujuzogufimukedinolodiz.pdfIn PDF document text
    • https://paradigma.bg/uf/file/memoxozopasib.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ns28fkhsddlrbfrm44no0fki82/tagawozurabar.pdfIn PDF document text
    • http://cy2hand.com/userfiles/23044456437.pdfIn PDF document text
    • https://ka-base.no/images_content/file/37984874798.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/oj4lo7sc5d7upp76hrjk585as0/xiwaw.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/6282075391.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/pamavemenizuwi.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/zolosivufajadapazivizobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=vtech+baby+monitor+manual+vm320PDF 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_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 11128 bytes
SHA-256: 2a99fc318287fc55d2f6ba01783bad925e608bdca830cf150b2ec71edd5bd86e
font_02_sfnt_off000135dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DC 18280 bytes
SHA-256: e019a7c5d43aab18c94db79d06725f15a8dd61142b3aa8f4b1c0e82eb0b47d6e

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