Malicious PDF — malware analysis report

Static analysis result for SHA-256 568187b0a5d9381f…

MALICIOUS

PDF

96.3 KB Created: 2021-07-26 11:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9052d1526ca7b885db4bfcbe285f4ccf SHA-1: 4e1e085089fe5dd6a9064919c147fccad524e326 SHA-256: 568187b0a5d9381f2160cf29896faf2ccc7047b93307a446626013954be66075
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b01e90b6---14018296192.pdf In PDF document text
    • https://aspaeng.com/files/image/files/mexurifekuvusumapob.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d74b5cad---tizexuwijizetuvaxevokena.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5900a98565c857743e46de28d4964abf/varuwozimebanenokidud.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/xerese.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/955a5d2e9435430c06b7a4cca75424c8/xoxugasato.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/rakuruwogagivipijuverigo.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b106731bfff---90649345741.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/80976545207.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/desorepunowuvepaxexo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210702081357283.pdfIn PDF document text
    • https://soechi.id/userfiles/file/49393316673.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/dcd3eb9e9dc63a5c1a72dd3135d325ef/musok.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/zorabusoxisalawuxu.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/54955112253.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/30456285519.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52243913d8---kevasexunozuxubufafegis.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f4aa7f005719f9b69b5ba98f61791bd2/20152690507.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6d9a86509ba98b73aee1f71d0438ebe4/supigojiruzevufubadose.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/jarizaxilofuto.pdfIn PDF document text
    • https://digireg.it/upload/sogez.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/koxifibidi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983a1152adf---77576086100.pdfIn PDF document text
    • http://ezibra.pl/upload//file/keseduso.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc931a0565b---duzomugumozozinupenod.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/mixuzupagowojudiwizudem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lord+shiva+108+names+in+hindi+pdfPDF 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_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 11024 bytes
SHA-256: 8f00e8e6d57c6c410d4b619c03409d29be4c1d4ea02a33bff6bbfc551bbb4c39
font_01_sfnt_off00013097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13097 16324 bytes
SHA-256: 28f0dd977681dfe4043c990a632c944b4a5c457e7d567eabc9c7ebe77a0e6c54
font_02_sfnt_off00015af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1