Malicious PDF — malware analysis report

Static analysis result for SHA-256 2253ec90925570f1…

MALICIOUS

PDF

103.5 KB Created: 2021-09-08 00:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4427c46880108387c678766fa960c8b SHA-1: a27d1b857a0be9b42dd611062380abc0f932cb38 SHA-256: 2253ec90925570f1f8c7773ffc5356efc1d2aa7a8b8a6e1752c5eced74beaba6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://tantex.org/tantex/tantexuserfiles/file/dosiperovibesonaropedo.pdf In PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0e6b53f8fb23f6aced54e5aa5338380c/venunoboj.pdfIn PDF document text
    • http://cabini.it/userfiles/files/44650238753.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/geqao7v16jdoc6pghkvvudbku7/mobipilofuf.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/pifaripefofifufidim.pdfIn PDF document text
    • http://nova-auto.com/upload/boledegikejujedumem.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d25385141---fokuxisigukojulemi.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///nezekuzonemefinomaweletad.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/66060006483.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/xujeninawupemefumedupagaf.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab1a6d1a2d---fupokukakilewexavem.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/704c0283cc95fae297060e208a2178df/reguzavolasuxesu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/bexuvuzepuxibapagejaw.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/14c2ef6953919156d9700e6af7c8f083/xofoxudetonusemux.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/73180515533.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/zubopuvubupu.pdfIn PDF document text
    • http://timebymtm.com/upload/files/panekeloripulenoz.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/74029605388.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e21b12cf3ec---66594723452.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7e0028165e57054ec43937da34ba1403/5170070132.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/90097703889.pdfIn PDF document text
    • https://soechi.id/userfiles/file/sosajutaxazavubuteseweze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gravely+zero+turn+mower+repair+manualPDF 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_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0F 10712 bytes
SHA-256: cf20c6035468b2feaab0f19b9241891ec3300fb71c86f58c841479e2bbcb665c
font_02_sfnt_off000157bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157BF 21724 bytes
SHA-256: 7beb0e6aed84cab32bef847303cc9cb5675b0ce6ea06eecda0e774ff704e8447

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