Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf0c8dd059a4094…

MALICIOUS

PDF

78.6 KB Created: 2021-08-28 12:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b29cb90ffe8a1095bf6ebf8e3006644 SHA-1: d89fe23aea0c27efe33cddd79fd2fcc5c96a32c1 SHA-256: 6cf0c8dd059a4094c36ab86b0b1e1d696bc6cd6c784c2bfe760daa57822faffb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming by directing users to potentially harmful websites. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nhhs78.org/clients/63854/File/webeketajaporedetofagov.pdf In PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/36250511641.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81369866211.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b84c185bc20---45621711580.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/grthohdte8chi12s0omb6foke2/vavovasoxaxupunapi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6257024b3---wimejozopoduvukave.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ce7lv9vpqufkq8oveqije5jg58/8638041498.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/vofop.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210603161503.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f66d90da2---60770656953.pdfIn PDF document text
    • http://hbaoge.com/upload/files/27100562889.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/27744447722.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/dogovulanolazaf.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/lowobixozemiredepovasabud.pdfIn PDF document text
    • https://ka-base.no/images_content/file/xusokagujanasato.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/25200451398.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/runukubarujuwoxokuje.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/nejokisune.pdfIn PDF document text
    • https://olterus.com/contents//files/28228287041.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/zitadexefibigatipokatini.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11e30525c---73401080858.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d61f3bffcedc0ec21389a7b20fc29e68/17582649666.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160947bd6f1218---9658434937.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2014cd62d---nilumuvomagiroxuj.pdfIn PDF document text
    • http://regmac.net/userfiles/files/gifetasigabudisugerimina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+remove+secure+from+pdf+filePDF 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_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 17392 bytes
SHA-256: 23c94f699cfd9cbfd4ae7f0d7343f47e51de90e6bc61bb0d80adf252f575d604
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 10760 bytes
SHA-256: 01939eec19d581703b5efee1360e3f08ebc2b97ea1195a916e531b631b3f9219
font_02_sfnt_off0001151e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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