Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52887c542de8089…

MALICIOUS

PDF

78.7 KB Created: 2021-07-04 23:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00294b99f93f143282e4c6a1e99076ef SHA-1: 28958ad21a0224a6b8643b8f99240c3833a3fc75 SHA-256: b52887c542de8089ffaf872388c6726c12b1e588855c14d4c66317cbc02f5544
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document acts as a lure, providing instructions and a password to access a password-protected archive, likely containing a malicious payload. The presence of numerous links to compromised CMS upload storage and disposable hosting further supports its role in distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • 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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5be7d5bf39d9f4ad4332602708a8a5ae/zenonevivabi.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3a27c3ba9ab864c7a8685f337a2a5ff9/81296525136.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/60716cbce914a2889cb1abc18d0944a6/54571657090.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a042c30bd25---46394526467.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///38990969892.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6daaa649a5---tikokapaberi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868016ce732---42873129884.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f2c5f31eed8953e057e77148afb4c657/gegubokejog.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9c51b23d76955c94699242f87e87230a/62452643952.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kmlr9r5abdshen1et6agnpgu43/17254934421.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a93d849de---41451859203.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd12fcd2537---wevafizuxot.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/780e41a92ffcc11f282370052a4cd926/93569302207.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/24136410026.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991a871fa8c---13086783115.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0be9ac8ed596d1c423f63450901b1835/warixupowimegosa.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/66c821b24bab8b222e9fcc67cefb7af3/69987686961.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9e9490eb19084724f28f94cda0dc87f4/23569974782.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f93c5fda1---37709491629.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a2abfbe46b84d8f90dffdf6ce560aef6/zoraxi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/tp716iti8i5t1basonlkttmbju/sigorebadasib.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b790fd155e6---7261878187.pdfIn PDF document text
    • http://yulintimber.cn/d/files/wutamebiro.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/41615020156.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098330e80aec---32479099408.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/gokozerixij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+amazing+spider+man+2+ps3+pkgPDF 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_off0000cbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 18492 bytes
SHA-256: cddea0a78a33cad14141eb615801493a03f16170c4db96858d203fbdd1e22bbc
font_01_sfnt_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 10984 bytes
SHA-256: 75bf0f7e8b73c93d5d53df2650bbe690ee0ada2a123f49ec857d70442b65fa12
font_02_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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