Malicious PDF — malware analysis report

Static analysis result for SHA-256 8927dd33eb1e404f…

MALICIOUS

PDF

85.8 KB Created: 2021-07-16 03:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14aa57a0a9fe404d22d934429149208d SHA-1: 7237659ddb0253ab27187b7bf9a51778d597bb4e SHA-256: 8927dd33eb1e404fd3f906f60843fe0688a3110b50c9f8b1f59f57c4c12c211f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond what is inferred from the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://condicionamentofisico.com/arquivos/file/puvonumagonitinidinazoz.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/laqc78ijr56ss20hg94en6vb27/lotebovizamuwaropexox.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/7948a9d6272d0b7cd9e1960e19caf91c/kagezo.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/917d4a602279e107e7036e75d87c1548/sirazogeveden.pdf
    • http://chromoink.com/updates/file/93037868888.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a203ea4f573---26506168978.pdf
    • http://dytac.hk/userfiles/72891669417.pdf
    • http://hiredriver.com/uploads/assets/files/41111353744.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607282d0246ce---63778776820.pdf
    • http://fosterfreezesantarosa.com/uploads/files/nilazevi.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/fa12a4d93ad2f94ec2f10d73b25009b4/17315581581.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/nerusikesivijoz.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0475239ebe9a6e8d6294eae67291dada/sexulunifefokef.pdf
    • http://stinpo.com/ckfinder/userfiles/files/dibaxaputar.pdf
    • http://villa-carlshorst.de/sites/default/files/file/17646617825.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/nufomipukigibuwibebe.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/83eb291c028c27dce881a7e2e1389c9a/6840533715.pdf
    • http://www.jindatunnel.com/up_files/file/36870606153.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/696uee4fso8956gtr8u584nu74/wajuduvexizar.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abee2dc63e3---xitunuperizaradofozer.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607942134628e---rapovuxelelu.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15abc2d0a---60962645582.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/79c74b95ea6c9e27e788280b425c608d/30518023964.pdf
    • http://sxhk365.com/uploads/file///zifokevokakopev.pdf
    • https://oumkua.com/userfiles/file/77356068981.pdf
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/wifowizevon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=editing+and+omission+exercises+for+class+10+cbse+pdf+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e985.bin
6ff41fdd017b39eac9487862cc11c2e0c0bc8d77437c3815558a8f405608729e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 11552 bytes
font_01_sfnt_off00010466.bin
18873c70baaea59ed5a6c5bdc12632f150548050c6f9be591daf24b2ae0c0c05
pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 17420 bytes
font_02_sfnt_off0001314c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 16792 bytes