Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95978ded5cd0237…

MALICIOUS

PDF

75.6 KB Created: 2021-07-26 18:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f63767e6b6671407613dadf34e38266e SHA-1: f959c8538ea85a2fdaa0fa45c6ba099edce709bf SHA-256: f95978ded5cd0237c4be2f157d1f25dd453f6a0ae3e15afbd0eb42e92bbac7bc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://kondicionery-fryazino.ru/upload_picture/file/zowibidirumomijagure.pdf In PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/pezinuvuse.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cfafcf840aa---59914385586.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/70627406083.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/91384829697.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/92918086392.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c063662d9d0---mepofudunos.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/64214b0689109569e9d46735dc078311/26748863483.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2a7b1dbb---97442266924.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/wojoguw.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/tujujajojoxizetefenosude.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b829cdaca42---54664555792.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/zogevarep.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609db4361d4a3---susaxilenitoma.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/xejap.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/97109288254.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e21cba5b71---8097943311.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/bowuririj.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/74037462b14400573dcfbe49a5348fee/gegibukigapuxizesuzatip.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b5405f6d3e9---zivivujovuzadagarekadedu.pdfIn PDF document text
    • http://simpli.ie/survey/userfiles/files/zazex.pdfIn PDF document text
    • http://ned.ru/uploads/files/26452096765.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/ruxebememutafawomo.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3e30b9b1678460b6e8a171ae57ed0fb5/38575500069.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/c8cc687f5cdbecad62544018f2caab82/baleforego.pdfIn PDF document text
    • http://abnicum.ru/files/file/fegelegisolowopeketutabiz.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf4b8bc73---zolasepisirav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=capital+letters+and+full+stops+worksheets+year+1PDF 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_off0000c4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F7 11068 bytes
SHA-256: f67785e42a74b7d003dc10a7a90ebd38ade5de22f873679e63f5a50a80004a41
font_01_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 15740 bytes
SHA-256: 5b058bed310cb9e181e05009a362d5fe0f1234ad84dd4e0d32e7a51898fd6374