Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3da5c22ea67b38d…

MALICIOUS

PDF

78.5 KB Created: 2021-08-08 15:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cfb12f3455a8c7367e90ca9356c211f SHA-1: dd195657d212d298ba3012040b89ca79c65cee26 SHA-256: d3da5c22ea67b38d26225e04482b8812a4493c6b2a48832788cff99acb9f7fa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous compromised WordPress sites and potentially disposable hosting domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7927729edebeb8d29e0fa30f186ef87d/vilozepunowipowew.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffb975502---mumobirejatofajozot.pdf
    • http://leadingedgecorporate.com/user_images/file/xewitedibebu.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/33lr98nmhk6pgq1ikro7q92ib6/sewazuz.pdf
    • http://travellightnepal.com/userfiles/file/12667817124.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47ce2d826---gikatowewopogovozi.pdf
    • http://jorkurojus.com/userfiles/file/zipipuzutuguguz.pdf
    • https://ludifrance.fr/userfiles/file/49670089976.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c5ee1b8050c73441e14ef4b15f615626/puzelifavigudufodijupeli.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f91cb2877---sotuwodovuvabidedupepe.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa29c46db1---zadijejenepaguw.pdf
    • http://ngoinvest.com/uploads/ckfinder/files/16887883267.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f666fe3db4b---fupajokimenujerotax.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42d4b5aeaa---6043541108.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/docpb673nef20relbq17gs412i/45819532598.pdf
    • https://marljivo.hr/UserFiles/files/gadovubodisa.pdf
    • https://larioenergy.net/uploads/file/61115526036.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc297f4d49216f5005295b9e465f5022/63920125891.pdf
    • http://e-cluny.cz/UserFiles/file/susemotafi.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e72cca205---kobufimixezevosapewulogi.pdf
    • http://salukool.ee/upload/userfiles/file/zulerefowolosiriwofiz.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/15506245939.pdf
    • http://kingalbertltd.com/uploadedfiles/file/73465900011.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cessna+172m+owners+manual
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d053.bin
394067d65249d5b7eb971a5a632da31fd26cea27cac8d73369da6efebcb12bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 16856 bytes
font_01_sfnt_off0000fc4a.bin
bb6f442edc0c9b1a27c44b504f4cee1789eda04742b9d9b9796e6602feadb88a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 10520 bytes
font_02_sfnt_off0001147a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 16792 bytes