Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71fb9ce62190afc…

MALICIOUS

PDF

97.5 KB Created: 2021-09-20 05:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70febef9b724e97fa4a715469ae6be4f SHA-1: 18de44fbb5bd06dc57c1a040749a3a39504dc428 SHA-256: a71fb9ce62190afc6d4f0f19c7781b85a5236bf79063e5cd01166362afc988a6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with multiple heuristics indicating it points to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. The presence of numerous unknown URLs further supports this, indicating a broad attempt to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7997bdd914c550843f9f93cd3dd5dd9a/sonodolediveropor.pdf In PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090811353078.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/95926287812.pdfIn PDF document text
    • https://oferta.lt/i/File/35842821124.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/15888754548.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/93311852429.pdfIn PDF document text
    • http://senkyu.jp/webroot/img/files/15633617984.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/11262039949.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/fajederotikepafim.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/86695287739.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/mevasuja.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/57383433599.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/vevigupazelomud.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/jozabofolobaxudibitigaxo.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/66138264482.pdfIn PDF document text
    • https://harmony.im/userfiles/file/41464584530.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://glassick.com/userfiles/file/vorupabov.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109172201162979.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/tuwelijizosagolito.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/jasigokodiwepemekumaja.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210918/16319011134170.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rbqvnsbr92ei5cfi5svpm2rtd1/palivizigog.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c430b93a1---witanodawovalajikagora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=rumbleslam+rules+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/69073311408.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_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 18312 bytes
SHA-256: 17228e0d9790f2d799968470b8717d918f7a0f0db1845e06e437700d2e2b07be
font_01_sfnt_off00014856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001606d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606D 10532 bytes
SHA-256: cbbac708ec341b997eb93248e2a223b5f3fa19d864ba5606675db698c3b85220