Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa681d30ab0f418…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 14:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7de96ff9169775584d0946cfa7bfe65c SHA-1: 35fe50cd53cdedebbeb9f323f6c53ac68455dd47 SHA-256: faa681d30ab0f4187515fdc038619baebde447bab8dba60a012ee465a9c61289
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to potentially compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cwesp.biz/upload/file/15189079063.pdf In PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/lusotuzolulolotebuxenuzok.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/feziwolomukutoresowu.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/92791569592.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/62467458086.pdfIn PDF document text
    • http://jsdarvin.com/files/4930679187.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/jewamewokizoraranukab.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/sufebokotojekusabopa.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/kegakopuzotukive.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/970c2a1c1f47a15ba5f5bbad5cf885e1/tekesisasifemade.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/69685290512.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bee8ca601---25591246785.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/levevi.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/36291808395.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/mitusamimofololewotu.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109290148342555.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/89682225824.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/489988823.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/372727c3521cc2af40ef32e5feca3e1a/lasedomowigefupomifame.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613407875dc6a---84618174258.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/rotazivetana.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/dokalixu.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/1576902809.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140393b83333---kebovujepapuxoduwosax.pdfIn PDF document text
    • http://tzsunup.com/upload/8182420803.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zogidenareguresuxej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tamilrockers+2020+new+moviePDF 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_off0000b4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DB 14428 bytes
SHA-256: fbb7dc69624f38351d8048a0953a8228d90db5f58a10933dc86458498a8f580c
font_01_sfnt_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 10744 bytes
SHA-256: 22014c9a8ee2bf1567b100c3802706f601f30e76561aa69de5414ed5c92b66ae
font_02_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1