Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd50ca9038b7594a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 13:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3aabb8ea3323803c51e95faa270d735f SHA-1: 1fd772963b85243e1b60c4b488560df9987266d4 SHA-256: fd50ca9038b7594ae523502222d97a4b85211c1f04ba8492d121501f6c09da99
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, some of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded JavaScript indicates potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=freddy+ultimate+custom+night+apk PDF link annotation
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/17441301323.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/dafegaxi.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/dopizaxi.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/82079595728.pdfIn PDF document text
    • https://blokhol.com/upload/files/wedanalixebukasato.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/bijepivasibox.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/33103591171.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/rowozofoditewiluxolodepab.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/79744107495.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5a6eb9d2---gozefuvabisototut.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/62088236498.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/xaluk.pdfIn PDF document text
    • https://asiapharma.la/files/files/zomufivanujobedobuvugivof.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/125059af6e91ba5f394e9871596fbfb0/besavixudu.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/47930996885.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/zadajawawalixemunomamoxax.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/gumafezom.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109030614046692.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/gc11iip2ukm5cln4cf64pug89m/76347067268.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/65785015945.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/68614178517.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/rutusojigafabipukunan.pdfIn PDF document text
    • http://kelvista.lt/images/files/bosituvemeradimeweluf.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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 11244 bytes
SHA-256: 9be7167aa03b3bd24824c0e7f136edcf5427da7653d55acec8e7a9caaea99663
font_02_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 20272 bytes
SHA-256: 3aa128a74801247d9274bcd139d2711bdbbfd5e3680b3c8f28e93cf6528105c6

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