Malicious PDF — malware analysis report

Static analysis result for SHA-256 0405d76ebc3ce71e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 01:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96148e06c0a81208e772efcfc56e953f SHA-1: 4e07623b69513e0416b89f04aa41a1741388da16 SHA-256: 0405d76ebc3ce71e137a7a790312e1a8b360d5d419b4339e5dca87238718eb50
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these links indicates an attempt to exploit users through deceptive redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://fontaine-eva.fr/userfiles/files/78177659002.pdf In PDF document text
    • http://smartwealthhk.com/userfiles/60034376896.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/9012847457.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/5696153584.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/febbf51ac2f8a744175ccafda671f13e/sutagav.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/14834852758.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/tuteloxetefivesa.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ef8df186---14963146064.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/zanilemadonewiza.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e32ec9df45527ad70b213489f870b6da/xazozobebin.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/lesopewaborifibed.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/vuzufekuju.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/zeranex.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5076e9a7---pofolebiximitopawazafaju.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/37634173496.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161307a80b5e51---34813635385.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161308d1f036b8---94921307424.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/tawigedijewig.pdfIn PDF document text
    • http://cga82.com/admin/File/lujejavomenomezadose.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/nuvuloroneridamojexavulad.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210902_8481E03C98C53243.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/94112612271.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/lizavarilafiwokowivegoret.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/sufizakituxunidumirewaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fpse+roms+for+androidPDF 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_off0000cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 10492 bytes
SHA-256: 1ae6cf6de7467005c833a7c0cebc7bec7b0402087076bfa9470710c381cddb04
font_02_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 18016 bytes
SHA-256: d7387f0b13029100f98dadfbae6992ea317d464452d51526bf13c6f0216e247b

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