Malicious PDF — malware analysis report

Static analysis result for SHA-256 051e802d32554ef8…

MALICIOUS

PDF

89.9 KB Created: 2021-07-02 03:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 69d23c48912cccf2a5cefffec61eef2e SHA-1: 1ac4a38334e1ce089d7a84dc7efcdc83b6e6bd33 SHA-256: 051e802d32554ef899efec04c9af421b34bf953a1e272270c067c9ba0de060ef
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to potentially compromised WordPress sites and disposable hosting. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be acting as a link farm to distribute other malicious files, likely PDFs, to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://cdwy028.com/uploadfile/file/20210629223022.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nboqqe0kil6h09afp1fqdacjmt/gunolibudoja.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qk5hmnkkg0vm5qeotjqbv0o9ul/7443446127.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c8326ed4e---jolaxovibenoxitataxuv.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/241246116415.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/nuwevosofinurivoveto.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/tirepiliduzedifovojigav.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/juxemo.pdfIn PDF document text
    • https://hagepoorter.be/files/files/76314931748.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160857c160f081---14445449164.pdfIn PDF document text
    • http://yuha.be/_files/file/gejomiposekog.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/gefufojodozena.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/80672214619.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b07d899474c---zaxazonenemafivojavejuvar.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/lasolexexisufuwikirebuv.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/10177391890.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/terukefogolebiv.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb51989cd05---peraj.pdfIn PDF document text
    • http://chapelguild.com/images/usr/5558161742.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8cc2633b35f97246544665308edef0c3/xabobutejafetawitiputexil.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9db91806---10481247048.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095dfac91f72---rumatovunefalilodomekobe.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6aec4f4300e4c223996d783707e4ea64/dokijugozeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+sword+and+shield+gba+download+freePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 11020 bytes
SHA-256: 958e0b51e1ac6deaca55b8c13b537de57ab95f9a5b388f7ab2196169e6e9c394
font_01_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 1772 bytes
SHA-256: 172309685fe98285604e713d49568994867313c34855d65ac26f2a3d6e9690f4
font_03_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 17036 bytes
SHA-256: a0c77d14ca1f6956bed5fb1cae73a935ca1d948738dc61f0b6f9612ae193b6fe
font_04_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 19944 bytes
SHA-256: a57066121a9f96d24940dbc61342c35c461059e7c5543855ab292d1d607b327d

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