Malicious PDF — malware analysis report

Static analysis result for SHA-256 27babc1e09062665…

MALICIOUS

PDF

93.1 KB Created: 2021-09-15 06:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 928ed0ba7f21471d0006435154c4e6e8 SHA-1: 3acff134ee8b5fe41cf9cb51415e039d66f52231 SHA-256: 27babc1e09062665d13b27e4828dfddaf2520effbb47eb0b5400f748d593a90a
156 Risk Score

Malware Insights

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

The PDF contains a link farm that points to multiple domains, many of which are hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to click on these links, which are designed to appear as legitimate files but lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://tomaszbizon.tomaszbizon.pl/web/uploads/files/96965945944.pdf In PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb1f851f6---bewudedopukuz.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://georgekoldun.com/var/upload/file/12875711560.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/kidatexida.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6654288442a2ba9f5c80682faa707ee7/zerutovutej.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/68627802120.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/bubamazoj.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxinidov.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161380f28dcffc---371344489.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403c1730ee4---bupuputi.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/bunuvatozuxowawanosunar.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/magedo.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/64313764059.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/91996040215.pdfIn PDF document text
    • https://mattress-leader.com/media/17563835540.pdfIn PDF document text
    • http://ubest.ru/images/file/tevamuwu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0920c8a98---koxubadapogakesi.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/98499807508.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/55acdae114526bb7e538bbace43f8358/2838483051.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/77302755019.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/23cf03e84642bfaba92afdb8cf9dab40/sofodofukutetemiv.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ef1f9deb3c72593710388cb341db2398/walogebex.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/71812169555.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/81631292156.pdfIn PDF document text
    • http://co-mit.com/uploads/files/wogaxenexabij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=locker+codes+on+2k20PDF 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_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 10256 bytes
SHA-256: 928f145d6e52b6a1b03d46f5f5f680f5e335df17ae7e72b7d53b0ab213f8b2fb
font_01_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 18896 bytes
SHA-256: a3bbb20df1b1bfece3a383c1c8733cdfb22c0c10e803e5d8f716095e572a9149
font_02_sfnt_off00014e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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