Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18408a821fbd3fb…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 13:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39bddddbf3067a1b7df590eb72a5b43e SHA-1: d4671e567d77aaf9482e3ce73d67f13dbecc627f SHA-256: a18408a821fbd3fb2027f0b595952fbe4c9b1b92d81a50ec3f69454fd4e95653
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://peintures-descours.fr/fichier/files/45798658853.pdf In PDF document text
    • http://krukaiart.com/userfiles/files/63487291410.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/jezirov.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/bewifadukokawojawejizar.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/93674540533.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/93742376110.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/78470973625.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a807d26d265---wigipaxujowoba.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f75e313b---94087188658.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/gamitogabagevonoviviw.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd3254348---61933307580.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d938745fa4a---sivezu.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/modutalebasodi.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/sifenomoxapasolomi.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/59306183863.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/23663818537.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/luraterixuratuboko.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/xivitekewegip.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/52006302871.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/fewawinovowoguzaxuvubu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e7692f06---dapow.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/xuxefaxekegelapabenuv.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/q4l7vplpup8loh9jjas8t68dgi/94777004772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tv+broadcasting+filipino+script+pdfPDF 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_off0000bec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 17404 bytes
SHA-256: 0cd3c0091f05901247378015acb5f0aaf665ea1ed696fb101f2b27ac3c06393c
font_02_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 10832 bytes
SHA-256: 90df7983e6f3b2b44986136f94741df27030867d70622fbdb9e2d076a250212f

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