Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d73c3372bcc1fa9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 03:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd0a749389151a0a61188b07318b888d SHA-1: 93443965a7c3033135f56628d416e69aea0b70c8 SHA-256: 7d73c3372bcc1fa9b1d91c88d0a3ca32ee1c2890ca56ecae7c84b140fe79cb8c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://synagoge-stommeln.de/ckfinder/userfiles/files/xilumupi.pdf In PDF document text
    • http://runo34.ru/attachments/file/pobokoneburirodujadelavov.pdfIn PDF document text
    • http://labotinnghia.com/img/files/79104231672.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7662061d7---53761856443.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/dadiba.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/ed0b5e0da1d6f998b49cb701c8af85d5/soxevomixupaj.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/1089777013.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/20058685135.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b3f7acb70---65604921908.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3ae76a4e7---fuzefupibakiresaxugiw.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/32214103666.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/67eo3mp6q9ferd5u7qbbo11n5d/67576611254.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/90537719952.pdfIn PDF document text
    • https://cartolmania.it/file/79808313545.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608960d9a0a14---89496597811.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78a5de1a1---genopudanaxujufewasusuw.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/15277944337.pdfIn PDF document text
    • https://diphong.com/uploads/18229562374.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/voxif.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/moberet.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/zepulowinexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=introducing+oneself+in+english+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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 10788 bytes
SHA-256: a99d3fa9dbf5ac43e72e9485f39a25142d52726cbb7ed0a3db065070af890e01
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 18788 bytes
SHA-256: dddf862fe68f0a2684bfc36223ba19f594eabbb035f5f403c6cd7ab9269f0b50