Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7e5dac5e11f785…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 03:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a57ad85caeda0fcc9c02b1aec677cff SHA-1: 6c73f64c25fb1906270d0e6dad25c518f824143c SHA-256: 7c7e5dac5e11f785761b686da5105ad2d01acd04db567af7e1370c0222bb7d98
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dichvuhieuchuan.com/upload/files/75987526240.pdf In PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/66938353121.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210916055915.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/kabidupugufexukokevimuw.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/84006486669.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/fefexasunobuvej.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/nasuguriritasapivo.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/butunabeziv.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/mumupuxikupo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494b3ecfdd9---11339160621.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/6337883136.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/66227776663.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/12698389554.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/binemisexisawujozijapa.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/wijog.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/navirasiwun.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ebff0c1f9557dfd6683d68acc16b51c5/zuzonanudejafo.pdfIn PDF document text
    • https://porfic.com/fotos/file/kaluzigebiwowa.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/xikujevuda.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/3102460799.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-07-01-44-27-11.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/magedikixuzug.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f898bfaff---zunevifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=el+hilo+rojo+full+movie+watch+onlinePDF 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_off0000b294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB294 16672 bytes
SHA-256: 9eb7f61334fa6d000d2d9e67eec031af1c8676b59b8832b23a434d7e6b62838f
font_01_sfnt_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 10796 bytes
SHA-256: f8d2e74f0a758ac7c2c6d268d4e9842bf4047b880459ee229254055facaad986