Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc11892f6a0e0f2…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 12:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb07f85df9aa136d55476cf382a0ae31 SHA-1: 11fee91020248a2cc72c0f0b38f2eedfefe78409 SHA-256: bbc11892f6a0e0f22a9ea5fb54df542191f40549330e7f8effdd2016e18d5b44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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 https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/cb6c7114be677c3a0c1d134917cb0f2d/notariwofagupubepijegi.pdf In PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/1898059146.pdfIn PDF document text
    • https://bfull.ru/uploads/files/89307245354.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a9d31aa57---35578059974.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6c6a116e1f8502c3d1d43d3b9a35fc96/43615940583.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/5kk4nh99gmldvijghahqn0ebvr/kixazitos.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/161546366941.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/22632220547.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22064004248.pdfIn PDF document text
    • http://mousike.it/img_ins/files/xegudesanujuz.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/weboxawe.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a8191b2df8adeb5ae5b9e721a2549656/pufuxomofukisedojo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3e8e18d522a5c845ff66b984f2572a1d/7672353653.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202181093544986.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9fa0b3a0---xeguzule.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/50903135475.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nikofunelufifulilozub.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/29558602527.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/kinupizigukewopuxavak.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/24976689732.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/i0t2vaso98fbqn8iredf0ks8n6/47105568908.pdfIn PDF document text
    • https://etimes.mn/uploads/files/munojabirosebotexafukefik.pdfIn PDF document text
    • http://midospa.com/upload/files/32782313975.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/rejovanikerixawime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=i+love+the+lawPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/bexapifebalejuf.pdfIn PDF document text
    • 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_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 9844 bytes
SHA-256: 87225e008a6cac6ff0dc9b3d9004ae67d2a2ca83032e8ec98483e967c8881782
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 19172 bytes
SHA-256: bdc0a2c5ab238c602886f3ffbc7aeb5be1d92f7c0f6791f20bb8417aed545539

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