Malicious PDF — malware analysis report

Static analysis result for SHA-256 408d7c400df0334c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 08:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30f32343f45b48da498a3535cc6172f1 SHA-1: cfd66df177e637df8ccb717402044d46de286779 SHA-256: 408d7c400df0334cd086d64cdb515b25ad0438d1da0c2c4649ef350b95e678a0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external links and compromised hosting suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=free+fire+diamond+hack+apk+download PDF link annotation
    • http://kashima.cc/userfiles/file/85874182780.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/19774485734.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/wagosum.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/30712925223.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/0h6g5vrudtfjnpt3stpps0dko7/67896597452.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/vowuburolezitafewiduvolap.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6e41919827736e2c9eeaed4bdc9f56e2/66840084315.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/985778a718740538e92d86fd5dbc9e6e/32775536712.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/xumaxamafodosezesov.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/23957270654.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/kukewasidezudapetu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613746bf1990f---50508297785.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe10603d3---29080624073.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/newona.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/2929739910.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/tidojifudojijexewe.pdfIn PDF document text
    • http://ndt-ultratech.com/files/soxosodo.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/wepeju.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/97952394912.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/77476447377.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/pusizexa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8E 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 10776 bytes
SHA-256: 82340f163dcaf7e6100a65bf73651f799d0f6b92cbf29ecefcdf675bc65f9d46
font_03_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 19540 bytes
SHA-256: 196abd09ea1727cc7e5601ca9dee24654a073a7f7956d685bf377ff380928a6f