Malicious PDF — malware analysis report

Static analysis result for SHA-256 b335c3c1fa9a98df…

MALICIOUS

PDF

84.1 KB Created: 2021-09-23 23:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 220806fa474da19bc371050ab0236c53 SHA-1: 2d081be605ab308735c56587ed3f6dff5ff3e5ce SHA-256: b335c3c1fa9a98dfa1f66211d1a73a6ebda28a40efc74f8b18ee465cdc0e23d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs indicates an attempt to lure users into potentially harmful sites, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=how+can+i+get+my+deleted+photos+in+my+phone PDF link annotation
    • https://needlugs.com/userfiles/files/batosamidut.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/66014309586.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/muruwuvusorebez.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614034a554ef0---tutizenazamokosum.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3195esoai90a14sbv9l1a2j3oq/91421186611.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/54236164447.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/vukepidefuwo.pdfIn PDF document text
    • http://geodez.com/pliki/file/41124681959.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/32078238262.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/10143925558.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210910101249.pdfIn PDF document text
    • https://baglab.pl/galeria/file/97358635528.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/kitutovasej.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a2800be00---radakedewuwolo.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/xozixodukupavoma.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/savufeledakonizo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/gafogutoxi.pdfIn PDF document text
    • http://boldogelet.hu/media/jaxedexozoguvaj.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/17296534282.pdfIn PDF document text
    • https://jagominum.com/contents/files/64517501464.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/letigalugafamipopalosebi.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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 11052 bytes
SHA-256: 1b7f58c0d5112489df30cd2cdb07d82f38de1bab0e768b92ec8053f30d8e7e53
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 18540 bytes
SHA-256: 10246aa6246132cec31dff011522e4d743821a7e75c17d2aca4a5c3b94d76645
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1