Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fdea3b052aafed…

MALICIOUS

PDF

97.6 KB Created: 2021-08-15 23:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 470c1a37e9675614606fbb958abccbca SHA-1: b283c9da93bef43f71b2776df80e607f47a04a87 SHA-256: 98fdea3b052aafedc880acb83c3bfa595c4602f7b0fa26bee74d1c3335a59b65
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of 'cmdqa1a9/48128267079.pdf' in the document text indicates potential command execution or exploitation attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/72ee0e7706a6967c569830729eb699c5/43199913710.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a781a979489---51279482243.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072483db86e2---1937097518.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/fozag.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ad7f26d6---50654954761.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6a2b185b---sejobevenu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fa075ff4a---rubamusivorizogera.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/ravawonipipijudixeviduma.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/wotarowe.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/gikezewelusa.pdfIn PDF document text
    • http://espressoperfetto.nl/app/webroot/files/userfiles/files/37318141888.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9c40265a2941d0cd10bf20087ffe6e4f/dakikivo.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/37152447064.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/fqphhi6q7o98vjta9scmdqa1a9/48128267079.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094009b3162d---43694365215.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/95844989339.pdfIn macro / runtime command snippet
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f25ac7158---39471957494.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/mufemasezudu.pdfIn PDF document text
    • http://etre-belle.su/images/file/56552972909.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e2fb8aa5---gafojujudukosipunupig.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/29124950345.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/zafezu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610579bd9124b---60480464542.pdfIn PDF document text
    • http://dhf-china.com/d/files/piniposobu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-cIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=aeg+electrolux+lavamat+turbo+16850+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_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 11388 bytes
SHA-256: fd993e7a8ba97b6685c746d3fcd4616223e418a128d1b33d15796e703288b837
font_01_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14623 18584 bytes
SHA-256: ee80d585d0635dba94970f107efab5c4c69dd25f708ed5184ffe8e2fc3f08bd0