Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf9802d5811c97d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 00:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b61b8ab78db0a7e4ce8b7ed0157072e SHA-1: c27a5f647c073879bf78ef95ce298f43f5cad442 SHA-256: 0bf9802d5811c97d357b8143559d5bed371044e80f5290695f3f71b40696894d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://lideparts.com/userfiles/file/1621694859.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2crho5uf8sfibvr0i6gkk6js8r/55528784225.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a32591e76e2fa03781177379524ad2d8/87368513497.pdf
    • https://karinbentum.nl/uploads/file/17725586191.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88949b6073---duwifisoketifebojewes.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/lititepupere.pdf
    • http://kaitosushisb.com/uploads/files/5505146406.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8bfd9bdce0---31250120029.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607be92d74664---9253415526.pdf
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/40635420156.pdf
    • https://ecoquimica.cl/dinamicos/uploads/file/fizuxubekijoxomixigon.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/de6f64450a1963b6f9770b0edcb44383/bosalirodan.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df516142605---84158105464.pdf
    • https://mogilew.ru/userfiles/file/28374250205.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/437dd4628510f57f21e2923aaedbf2c7/gojujipusalavurazajedutik.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7edfd87ed---fopinuvutizodubafedawo.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a9cd08c2---tizan.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160afca13309d3---5558995039.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/aak9ufhva95t8sv4b15jb870dv/sologufafotowapimaz.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a7279bccfda5f88694916ccacf118a26/dudoxokokenuxetu.pdf
    • http://ventensis.lt/public/ckfinder/userfiles/files/32074527207.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/22976246626.pdf
    • http://old.smartplus.pl/ckfinder/userfiles/files/36824127212.pdf
    • https://ln80.cn/filespath/files/20210812210209.pdf
    • http://ibtaker.ps/userfiles/file/68059808286.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=napco+gemini+keypad+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc5b.bin
865afb70e4abcdd82cbf1c084c06aee2a93f93b6c14a411d33eff441796a2531
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5B 17820 bytes
font_01_sfnt_off0000fadc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 16792 bytes
font_02_sfnt_off000112f3.bin
967a2adc5303536d2ad9d1a67b9b9b6f4ba15a61fb1997e08509e981d7cc2933
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 10772 bytes