Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d82fc39b16030fb…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 09:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35daca3c594b30a4eff09c7be08636ec SHA-1: ea9f30f0f3c3a80c7813990d00e339c423bbe44f SHA-256: 7d82fc39b16030fb1b4a57789d4a2ae8e2c1d57cc00e5ed55584f570430c90ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/metanipezuwevosagosipi.pdf In PDF document text
    • http://yule-sign.com/upload/editor/file/20210814235321.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/1367408121.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/kebeforenebojise.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210621_203700.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084abc11b19f---31596867067.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/85833790523.pdfIn PDF document text
    • http://atiksigorta.com/files/lowomejexobosuparowef.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/pudobalipe.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a17008b68ee---varegixuga.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca1d4eb38---duvavisafazofajasasi.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/jaxar.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/87496bbf44c452683fa4346f94f28fde/ginudutajasaderofal.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e230d2ab0---66761169084.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/musimaximoso.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/fuzolexuxefepifefem.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be8a0f21133---riduboguputetosinu.pdfIn PDF document text
    • http://fskyok.com//uploadfile/files/ridimekategor.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/25546378261.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/jogofixuwedawimup.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/dk3o0atcjo93if9i2f923hnq06/runujafumaradikaxukew.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e08391c970---90650369346.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/655803857.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9a0789ac---65658938216.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcdef0c6d---41416598470.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/32115864163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=organizational+theory+design+and+change+gareth+jones+pdf+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860f0aabbd9---pudedipigelefagi.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_off0000bcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC7 14624 bytes
SHA-256: 43c6d7d478012d89ab6b03c4cc51654053fd8110f619871076abc177b0b58fe7
font_01_sfnt_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 11316 bytes
SHA-256: 17898b1a447e929c46c56cc80ec50e61f1ee1187f58ada9767e9f5303771d283
font_02_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1