Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d5f8b683034c89…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 06:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70d02f593049d25d4fd1a6e90fec653d SHA-1: c7aa4b508f5961cadf0b4b333093687bd3ae177f SHA-256: a8d5f8b683034c894d418dfe84df8f9af94b61542b8cc0a892ad6217e9f0c027
116 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the presence of a raw IP address in one of the URIs is a common indicator of malicious activity. The document's structure suggests it's designed to lure users into clicking through to these external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/365b39684b15388ca649c83cda15bf76/nibovawevawiber.pdf In PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/begogepuxuwaluz.pdfIn PDF document text
    • http://crm333.com/documentos/file/62827787608.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/46157750821.pdfIn PDF document text
    • https://redac.ch/upload/gatisepero.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/71993210803.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/30438101819.pdfPDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161380152288bc---65541412215.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613566310a593---27300056648.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210904073219271909g9yylrzvcyvr.pdfIn PDF document text
    • https://polytex.de/sites/default/files/29347247317.pdfIn PDF document text
    • http://master-vin.ru/files/file/pijiziles.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/19754046655.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/17029387106.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/nigelakirixazamumot.pdfIn PDF document text
    • http://zl369.net/userfiles/file/bidudojaduj.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337aea2b9ba---55117636876.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/doxiwafojimomizikugajajeg.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/32641446666.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/86419803400.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/21401342654.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/34472170174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gta+vice+city+modern+mod+apk+download+for+androidPDF 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_off0000b465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB465 11012 bytes
SHA-256: 1ebf89bfb741b1092107b439d1bc89bab7f4b991ebb5726908d676d5c41567f5
font_01_sfnt_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 16960 bytes
SHA-256: c49fbbb85cb10c11e0794a3a43ff6d96938b8cb525408e4cf206f095eb03f39a
font_02_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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