Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b6468ed2219b34…

MALICIOUS

PDF

80.0 KB Created: 2021-08-18 06:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f637931d2ccada5a479fb3781cbf8f9c SHA-1: 961e31df00fedfa3e74db4f6078dbb9b3d37a381 SHA-256: c8b6468ed2219b3484f2c4ad52a88b163b7c94134b6486f67bd5a54d4eebabd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kfbma.org/files/fck/file/53087090676.pdf In PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/37923703217.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b22a83b209---80882131456.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/c2f626077a26771d50e71d588f5d32b9/xuwezomedikawe.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/mawezirokevovilasowe.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c018e6f53---janabuzexuvoxijevibuvozaw.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/89964868875.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/18366914799.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/74244300245.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/zodorixepoteb.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7714f833c392c915110892b291dc8e78/36316184790.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730c02cd6c4---20760469302.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f6cab77415ff23770a2e91e28fd16867/30961920545.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9dc80a78260951b7c14f40eeeee4cb5c/wewitowetilifo.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/30556147257.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16099f3ff4d06b---22538483036.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/wudezebinixujasamebak.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/abd571807e890814d8f087ea38f90a74/lafiwexabakatemov.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/31204811580.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/tovetojulirifafefejoxow.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/20820683619.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/bibojamuzigiro.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/210385714060a657055303c.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+juice+mixes+well+with+crown+applePDF 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_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 16948 bytes
SHA-256: c3428e3368c4afab2aa7fd82a041c32c3ecd070316570f1880f080b3263bcf33
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 11052 bytes
SHA-256: 7019352fad41c20eb19beb77de0818f44ca3eb3d43862e0649b55f2741263bdd
font_02_sfnt_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1