Malicious PDF — malware analysis report

Static analysis result for SHA-256 195078ba6e37e768…

MALICIOUS

PDF

74.3 KB Created: 2021-06-25 13:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2e40bce65b01bbff20c52dd42871ef7b SHA-1: 5ce7efcebf3738f90f2d3b8a00c40d4ca1e6dd26 SHA-256: 195078ba6e37e76883fd47a9d58922b8973521af4e055cc264d48feebbf5c88f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to PDF files on various domains, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/58d5vmk4r7tg2g37msubitpfsp/mofemavamapolisiva.pdf In PDF document text
    • http://meadescafe.com/userfiles/file/1746594576.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607246bbb9b2c---feruzoforewimiwudu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5276f72e7fd3905b170bf9612a82389f/nugowovuwixawuwewadit.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1bc2fb8126f83e93fb86591c253f7ac5/81265352589.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/gadez.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ef54c4b0f8f19e6c033d50a56928ded5/67634353369.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1007201eb---rusubopexevi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b0410c822778605236fbcfa5c450174c/rutanud.pdfIn PDF document text
    • http://krzeptowski.pl/file/fubifusos.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bcb8d4f21---titokusafejatoxenosutez.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/fudajori.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073376be764f---retonesufu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c382eb36b1bc97a3694167ce6e0b9759/73193994221.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/venaxujanowolizog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=by+and+down+the+river+lyricsPDF 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_off0000c03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03D 10788 bytes
SHA-256: 2bc5e8e119ff623b1dc9124028832ff26044728005414b1db6444d19f5a905b5
font_01_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 16768 bytes
SHA-256: 42aaf25444e87ab28afd4e0bf4d4c5b2a6d752e4aef724094ac976fb6686721e
font_02_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1