Malicious PDF — malware analysis report

Static analysis result for SHA-256 142b5f10553c1c40…

MALICIOUS

PDF

96.1 KB Created: 2021-08-12 10:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: ed0e814cba4643743af0b312b12056a4 SHA-1: 5014316bafb51b97f7112c039d0fc50d0ce2e486 SHA-256: 142b5f10553c1c407f5c0c8ae55911fe99454d20563651e0877552dcc880208f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting domains, suggesting a link farm for SEO manipulation or to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://finpacecuador.com/userfiles/file/dokevepafa.pdf In PDF document text
    • http://architettogherardi.eu/userfiles/files/xivatojatikuzagi.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/2m3rioif0kttjvv8il16ei0rd8/12380046583.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/41801167848.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/35097606478.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16079c33d2994e---58601893867.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/rojitunuxexijufapujeno.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/gilimodokikoxabobusuz.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/tosopuviwonatodategesu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/a04bd4a4f6034c786a145641aa67d3bb/petubaxujuvorefezutitesid.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/e2ge0hb3t8lbcfr0va8r0d1vbj/kegobisavesid.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083826159822---56795655962.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b64a29bd0---96973627834.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16070a29b52293---4271269374.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a85c05219---23386774690.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/66977701809.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3acb329a---vorulo.pdfIn PDF document text
    • http://cl-pub.com/files/files/89672719176.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/xobupitatuwixozi.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/kmho72afsddue4b94rlp2gt6kh/86816503539.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/na0s44qladqok1nlccv9b3d211/4599393903.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/98377254319.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/vjori1m3bnm7h1h24032ccesls/32491499617.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/66105824702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=crash+course+world+history+the+columbian+exchange+worksheet+answersPDF 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_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 17672 bytes
SHA-256: 1aaec5c657b98126d27d723135befe9c353f120cf31d7c6d62114bf416a61aee
font_01_sfnt_off00013e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15629 11480 bytes
SHA-256: cccfd46af7aef19fe31de3c0d0e26ad9d32eb9760fd282bbd8430391d8ad3c02