Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8005f654131392…

MALICIOUS

PDF

91.3 KB Created: 2021-09-22 11:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb9ed215b51cedadbd6142f222efeccd SHA-1: 999103b9119b4712e9092995a6120b14497fc918 SHA-256: 9a8005f6541313923a928cdff50fe6019d1f516c942f2da60693d38a82565a91
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate it functions as a link farm, with several URLs pointing to compromised WordPress sites or disposable hosting, and it employs a 'Password-protected archive handoff' lure. While no scripts were directly extracted, the presence of PDF_URI and EMBEDDED_URL heuristics suggests it likely contains or links to malicious content, possibly delivered via JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=class+4+maths+chapter+1+pdf PDF link annotation
    • https://abisspaandboutique.com/nbloom/fckuploads/file/42124337024.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/85775396637.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/35783075257.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021092121041050.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/33703131691.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/34308213709.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/54022012136.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/lujemukapoladipubizulex.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/ledulerozetifajodalu.pdfIn PDF document text
    • http://ktcz.eu/files/files/22897078715.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/mifuwutebenijabixik.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/32146661675.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530ebee196---vagagedirisegitojovas.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/sopalij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acdec2b988---sabovotafujufevaseg.pdfIn PDF document text
    • https://shidoremicrosys.com/media/86379658085.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/wenep.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/4720002655.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136170c4648a---40048724160.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/54354786364.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/vepimam.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/regetirof.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021091016312988966.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/reveziv.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/wamibusuwe.pdfIn PDF document text
    • 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_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 10728 bytes
SHA-256: d0175ab27c991debf548c4d3679b78b7ecd7dff55ad1a7360ba501408692992f
font_01_sfnt_off00011597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 19360 bytes
SHA-256: 2a0c3534d702c0ea4d633133ca3ef738c02b1c127822c0049cae3e4e18b7ffe3

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