Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d56ff926ae911da…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 07:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 174e22fb9c2d2b995c438e0c4697960a SHA-1: b2aa4a7656ed9fc8be61c07942ad0a99ddcab9ac SHA-256: 5d56ff926ae911da0a38e262dddcb66e122ea2b44e6a019feea3f026fed43ed3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://beautybybelief.com/admin/images/file/kapisoxodafabamesevizu.pdf In PDF document text
    • http://andreaslasnik.com/data/files/ruritigowoberixunowufa.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210917104646.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/72229213115.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/81110682967.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/dululogeridoxakaroxoxalu.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/31087227412.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/gowideduraxeluvusodavebi.pdfIn PDF document text
    • http://k1a.ru/images/files/file/dukowitega.pdfIn PDF document text
    • http://cecev.com/stockages/files/59812836891.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/gulejugasijepanubafog.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_183D3DA8456E0552.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ef12797a---legebox.pdfIn PDF document text
    • http://sjhtractor.com/d/files/kuxuzotezal.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/ponorebix.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614934122f9ca---79466384816.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b99ff77c6b---68611086471.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/veviponazusuj.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/13936792283.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/32007168879.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/saxumejapiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=play+store+install+free+download+app+newPDF 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_off0000cf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0D 10692 bytes
SHA-256: 9a221686d7ae033c2896170b5c7ca1bfbd15cab57a5e0b01611fa9ccda75799b
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 16784 bytes
SHA-256: 82b5f1f674f7e3704a447ff4c54bf728a59015f49c8e277380d5c3030e403555