Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b2030bdacad09a…

MALICIOUS

PDF

71.8 KB Created: 2021-05-17 22:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54bcca050ac8a4a8d525881c12dd60ab SHA-1: a130547215b569ed698ce69dc74879ed40a324ba SHA-256: 39b2030bdacad09a66aa99144d880ea2be197f7ca535dcaf5c457ab52d3fcaad
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically referencing 'fake wells fargo bank statement free' in its metadata and embedded URLs. The presence of numerous links to compromised WordPress upload storage suggests an attempt to distribute malicious files. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=create+fake+wells+fargo+bank+statement+free
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ab2b38ed8d---fabonozek.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/wifewisa.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb875c0df7---26553220551.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609876829c4dc---23402084816.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/clo92hkpf4fnj1jpdfv5u7qc52/bifirenon.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f92615386---toxipelefadowuvigeba.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/a7kmlul1s5lnml5pg4hbot8ge3/kapexetususavewurudeb.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/e3a998b0b50840a5fc85850b2714aa32/puzunifopedenopi.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/h7c0m22c6kjker85a0bcfcaik6/32614599476.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cea137f50---denabajix.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb616a9535---wiletibowewo.pdf
    • http://akkoryazilim.com/userfiles/file/nigatofotitosewaja.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/105819cbffe9adc309e6da322b895f01/xopazegojasifiw.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2a5c20f3---17043292564.pdf
    • https://betenagro.com/sites/default/files/file/16939587382.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822ea0bbf83---remuzem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f2.bin
40cff2d938fb45382867a9097ddb928f197da6fe98710116a9ce5bbd4b089d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 5288 bytes
font_01_sfnt_off0000eaef.bin
5d28db12799006947ac7700dfcdf8ded02529adedfc32e72b6771f24249b8e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 11008 bytes

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