Malicious PDF — malware analysis report

Static analysis result for SHA-256 b503a2b7dabaab98…

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 02:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16ccaae933180f0655a0c729347b4cc4 SHA-1: 8db0c7275e464ed5871ba172ab84db9ea6e28fc2 SHA-256: b503a2b7dabaab98d4c92ca9d191a2e7b7a8f06e8d39ad43aea630ecd31fb458
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML classifier score. It contains a link farm pointing to compromised CMS upload storage, suggesting it's used to redirect users to malicious content. The presence of numerous unknown URLs further supports its role as a distribution or phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353bf70044b---beveseduj.pdf In PDF document text
    • http://kozszemle.hu/uploads/files/rowop.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210905020037.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/kepezajatezud.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/rebel.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/92494785227.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/pixojilofavepagezu.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/mepeponoro.pdfIn PDF document text
    • https://eventaipei.com/upload/files/lawumatat.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/jeduveribogaxelukowir.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/paxadezavixijunapetepa.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109100910507246.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7aa7acdfce1b558dc5685e99418161e1/14949555056.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da56f37391---46802664230.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/36882221856.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/pafusitebupagekewigabe.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/38594023840.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/vegezomoxewotufu.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/gegogofuvananax.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/mokumizobukipemepamevila.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/daguse.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad0f475a1---94017440117.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf3b98ac5---48394519778.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/17602780922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=suicide+squad+2016+full+movie+watch+onlinePDF 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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 18984 bytes
SHA-256: df08abd6a9ed3047bbb848a2b526e64b9f4871c8ec4df37c8389f7118bb636d4
font_01_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 11576 bytes
SHA-256: 71a89631fa57694f6caa56f128bb3604050d826c64955d9b2aed85d129aed889
font_02_sfnt_off00012f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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