Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ec5cb50f05c465…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 02:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b117bca59d66c2e31bdd232639455ad SHA-1: 05a32a6d6c6e582cf12445869fec1805e8a41a85 SHA-256: 87ec5cb50f05c4659c2d156ff28d7ac4e4ec1d14813f4d5b72a88e8fbb120c1b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are identified as a link farm pointing to compromised CMS uploads. The ML classifier strongly indicates maliciousness. The presence of JavaScript suggests an attempt to execute code, likely to facilitate the redirection to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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://realfootball.gr/userfiles/file/63235648052.pdf In PDF document text
    • https://www.xyoaa.org/sites/default/files/files/votanexem.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7salufi1sk7g46n96ifhrik308/35104050592.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144fa5f71d7f---nupufizugexuni.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/98444604953.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/rewotarabadutolagolagepez.pdfIn PDF document text
    • https://avela.md/userfiles/file/molunenegiw.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/32547783075.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/zapiziviv.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/14827091243.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/ledofiselumugexuneja.pdfIn PDF document text
    • http://dmkert.hu/files/file/pidawa.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/8309041649.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/gejunurimomitakop.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ea0ec22c---konokavevasejajekejoxatut.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/94454237395.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109161650133734.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/51195797933.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/8627380528.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee6fd092c---83445612573.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-21/20210921075028941286.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/datamagudewawuzaz.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/19631812875.pdfIn PDF document text
    • http://sciattella.net/images/file/virasojega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=latest+ld+player+versionPDF 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_off0000bbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 10524 bytes
SHA-256: 3770f57023078f569b854e5c3012f7b4d337263145e2f3dde9300d9d1e0c58e4
font_02_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 16864 bytes
SHA-256: f41353af0e1684aed3e1d801b4350de71d30e50dfdc5fb34bad193846e2a10f4

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