Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bf9bc1c1e9636b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 13:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83777f3497fed8c2b919b55f087fbc94 SHA-1: b79986d482f2340c49d7e7eaafa58937c8a243dd SHA-256: 03bf9bc1c1e9636b7c12798e65083d6eb866d7db4085034ff05c837b27896df1
172 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The presence of embedded JavaScript and external URIs pointing to compromised WordPress sites suggests an attempt to exploit vulnerabilities or trick users into downloading malicious payloads. The ML classifier output of 0.991174 further supports the high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6cf83ddbd0be6be82e397fcb4d6ae6cf/59033059917.pdf In PDF document text
    • http://novastal.pl/userfiles/file/98522489131.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4b07e6f759b4665d589592ce862ce65/veragovusiridotegegosal.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5lkg9agsjbfmsgs9pfulilt5r4/66499525717.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/rerawarologurivilide.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/74468368141.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/66368160903.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/dawupulapademisoxilog.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/2009420510.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/20659178067.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/65457872945.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/70986869460.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61340bb8d3608.pdfIn PDF document text
    • http://shahgrp.com/uploads/tikin.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0457dbe3---19223284094.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/wajezoxokidujademuwaz.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/54337829859.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381d55c39a6---78798019786.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/38957144997.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/paxoxerip.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/61989880204.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142172fc8356---madapuzudepojepuwifezilo.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/kubunimiwajezakofutabog.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36204028e---dezovuwuleno.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/84ee0aed016d0b32c7f879781c2e3f6c/xokexuwimenowewud.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/mofiperenov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sarvann+full+movie+downloadPDF 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_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 10576 bytes
SHA-256: 38911f32b32807e93050685f0f0fb79c5c3a1a728c31bd47145f0342c2b9d783
font_02_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 17692 bytes
SHA-256: 3178c0a5bbc6777bb83e303fae64a9025d84b6ad616d3a9c8cf20454db178213