Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fe67b3fdf4c3bd…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 01:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 615d5bfc4583f5532451d5f0d89e1352 SHA-1: 003b96ddfe6eafc8e0a0826ce9aec448dd62e3f6 SHA-256: 51fe67b3fdf4c3bdca221a7e43cb5b2c354994597a6534870f56f72ad51c0c05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malicious content distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded JavaScript, though not directly executed in this static analysis, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a479aaf09bd---pobiv.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/nm2d6j8s16cv5sgiut0aa7rflr/sudutovoxezevuk.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aeecf1b27---34862183724.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/33055567473.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf1c5a9feb---zafefiwawegotowimid.pdfIn PDF document text
    • http://secretinvitation.net/images/files/tuwanoxedekas.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078761987539---nazivurowepakafodoxotux.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/xugot.pdfIn PDF document text
    • https://securitydm.com/slicice/file/3803701891.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/ruraxilokibu.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/99263719317.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/23630554037.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/9536919528.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/87585541557.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210709163823.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/71404132762.pdfIn PDF document text
    • https://termoformat.md/img/files/46289868376.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b09d6c96503903bebb459168f7678a9f/kalojagekalasena.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6bd17bea8---29945617148.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089b241debfe---tigapi.pdfIn PDF document text
    • http://darec.sk/files/files/bimapexagilol.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/89559483736.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/79859828842.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/laramoz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac251aea6ae---4204564766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lyric+love+story+andy+williamsPDF 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_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 20800 bytes
SHA-256: cdf01bb20e764c07cb2c8985b25b7607c3bcf97d894d9d6aed66c0ac739e90ca
font_01_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 10756 bytes
SHA-256: ff51ba5459e34291d7a49c0a4b9472265730822d52113b96263f6e3905d9b3c3