Malicious PDF — malware analysis report

Static analysis result for SHA-256 219e11530803b11d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 12:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 399d03c32d2bb32d6b305e4323650329 SHA-1: 160bb5540b1fcc9c61e369b1cf378dff3494ff3e SHA-256: 219e11530803b11d4c3df370d56b22f0d336a613fd4bf13d1a58e9f7762c5330
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://pistant.ru/uplcv?utm_term=doraemon+games+android PDF link annotation
    • http://directopinion.biz/uploads/FCK_files/file/46357485154.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/zeninisarumidatelasalazu.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/besokapamesalojuxolitiko.pdfIn PDF document text
    • http://www.520amis.com/upload/files/kutepimepavetaxuwebun.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/37808974904.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/03fd29b25ac88a68e5a5fd0363512bde/wigevozusedajuke.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/12273101179.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/14969fe36b89c82d231fb3cfdb8ac5e0/geviriwiketozepefapuj.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/27038056.pdfIn PDF document text
    • http://ewtch.com/upload/files/gotapodemixadarasom.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/nojamekonisewidaj.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/55112386309.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/tidirevezunogorogutuwar.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce6ba8dbc---68813973520.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/fegigobisurefosimudafiwi.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/65418320766.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1632321471.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/52934570471.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/91487862762.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/63143764600.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8343ce172---lovovivusut.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/vakejewubim.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_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 15944 bytes
SHA-256: 62b12c4494f12bdd54ce3541ca4e69cd5b0edccc5dc6e0f29a072435c05b07f9
font_01_sfnt_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 10448 bytes
SHA-256: 456049397b1bab072945d3daa19b2d072e63a735fe8a5d3d9fece6266e62581c