Malicious PDF — malware analysis report

Static analysis result for SHA-256 c466b03053e21f5c…

MALICIOUS

PDF

92.9 KB Created: 2021-07-31 05:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 425f8573f74e563dcccf1a269a73cfc8 SHA-1: e3e2aabc9132a2a90588d1a60c8054ec0d11a06c SHA-256: c466b03053e21f5c844a9ce672bc3776707824c3a07e0869da1a8432b4ce537c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to numerous URLs hosted on compromised or disposable domains, likely to facilitate the download of further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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://bahispesinde.com/gnc/veri/_files/98837166473.pdf In PDF document text
    • http://epoxidice.ro/mm/file/76172606905.pdfIn PDF document text
    • http://dzbnf.com/upload/file///62332322398.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a005a7e2917---78737957333.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e66f2f797---18319428056.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kimomunimi.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/94617377201.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076244c0e701---33082166918.pdfIn PDF document text
    • https://ikansambel.com/contents//files/rubozuvub.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210529210351732.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/negebizufusotojegaji.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qbs08c5i6d57pii850esem6683/tosazifotoxefereziletafom.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/gasot.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/bv6n3dkrh1o9j7ued2alinbfs5/setozefaki.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/3f53a6af2511f683650b54ce928d8fdb/20889934360.pdfIn PDF document text
    • http://iccarrentals.com/files/file/levisizegem.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b47584d93---22305080149.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/7io4o798hppceiveqcthjfqqe6/34527126711.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/bitagiwunalajofokexakubet.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/77981344758.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8114ed15a---gomexanetarowinevuzana.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624354560.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0d95dd46033eb6a84f63fd5493542961/77848548456.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/dodizu.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/tozimipowomulizodis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=direct+and+indirect+speech+exercises+for+class+9+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_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 17772 bytes
SHA-256: 165b4b5d88ddeea2c2e817ecf4358bacfdf83e03a1c84a7200a7074b497639e1
font_01_sfnt_off0001336f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336F 10988 bytes
SHA-256: c04a519e64b94a8897d4ad0ad0d791acd0c03a912a93427ac4056664c553e55f
font_02_sfnt_off00014cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1