Malicious PDF — malware analysis report

Static analysis result for SHA-256 406aa846a4801916…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 12:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b59b26697891deb4cd04efd41edab32b SHA-1: aee8af28e78b369ea9b0401f43a4f9fdbd1c462c SHA-256: 406aa846a48019160d4640556b2947fe89b265ce4322ab6da7ea8a6ca77cd439
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sandp-engineering.com/ckfinder/userfiles/files/fojidomukurev.pdf In PDF document text
    • https://www.campacinter.com/image/upload/File/bowas.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/48b5242ffc5b6486f0f31e13030cf6b0/82679597432.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/139280050.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/zutojuletixu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1fd5031f0cbdc6708c6f29e4998f38d8/simopozewejowudogodeneve.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/26170584621.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/todalimipadiwogadekil.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/jatifoji.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/peu2vtk7pepi17d2lmh5r80t50/nalozovapinuwazekir.pdfIn PDF document text
    • https://revive.fashion/upload/files/43448757974.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/69990441720.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/26575614462.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411fdb25327---23735542248.pdfIn PDF document text
    • http://jarosi.hu/files/file/29758736719.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/ruvex.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/2scsl2r6ps7f6bi5r03sujg6fd/raregutituvitufakataripux.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/zaponenajosobuvowir.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/45419625404.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/pimawutejiwoge.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/mapogavokumiranuzudofiz.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/pinenuzetigunixoxig.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614290f30c4fb---josukogizadipuwuwexeweveg.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4259155e---mujivikijogoriru.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/18112936450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=coco+movie+ytsPDF 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_off0000ba1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD235 10192 bytes
SHA-256: b58b31c78f06205b13c0594a9cadb02e170498862f710c512759015e94ee756e
font_02_sfnt_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 18440 bytes
SHA-256: 0871563dbef8e3c9f926f8d94767f9778127004d1b7c6e4d3fe3bd440dee3d8f