Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d018029ecad3ec3…

MALICIOUS

PDF

157.2 KB Created: 2021-07-02 23:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efbf1506353e773ef9c8527484147c99 SHA-1: 14ac9666e9ff02f72db495f898da159cc8cb4819 SHA-256: 0d018029ecad3ec30184f61e45c0a8c53147e8844637b56c6c09833f1e504f7e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious files. The presence of a 'password-protected archive lure' heuristic indicates the document likely directs users to download an encrypted payload, which is then intended to be opened with a provided password. This is a common tactic to evade initial security scanning. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9246

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a43cd69bfcb38639771aca09e572c382/55639058943.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93b909458---72540214336.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943a212c02c---77077455453.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/vijelidixelafivin.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/kumifusalonorijunipizasa.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/ninefirevokob.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c560c22fbd2---vateruvuvedolovugaseki.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d1dd20d0b---sekupojedo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/989e076cd4585e3f207c9e157ee15fd8/kawekokuta.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c391709176---fefogalexo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/dujarenifojo.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/ca84e8e4b5fe18e50ce2e7b97112f94a/luwemuxaregesulomiwodixem.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/btofrlkpb7j8ub4q1mgftdjvkj/vadatalogediwanevufa.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/gudovotimenakulumorazowir.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/goxexel.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c117ffb5883---xunonupazesulinifesugop.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/bekemapikew.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fd44a2bc41aefbb18d6fa4628406d282/14609259114.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f21cd6a47b176bf85e5f49adf421642d/jegojosab.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/66904845023.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021052609444973499.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609841421bfef---rosajimuxuvubamalij.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/11427215621.pdfIn PDF document text
    • http://nprofit.hk/userfiles/84366117074.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5cb81012cd6e0f2c6eeb4660482a1a0f/gasaxezolinakiri.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/72519285371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+bypass+survey+and+download+filePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC7C 10988 bytes
SHA-256: 4530f4f4fd6e7ce65ea481cf6f418a8e3995396ac9e5bf7ff289ceb4e77fce50
font_01_sfnt_off000205ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x205EE 18760 bytes
SHA-256: ea2e3bb256846dd75bb1bf1ff32d2c6acc0e45f5438a8c9117492fdab86d4801
font_02_sfnt_off000236f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x236F8 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_03_sfnt_off00024c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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