Malicious PDF — malware analysis report

Static analysis result for SHA-256 615bf530be167c8f…

MALICIOUS

PDF

80.6 KB Created: 2021-08-11 07:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20b5dcf8c8d6a051a894f90d16ffad9b SHA-1: 87bc99764c32927dff45fc9ab8720c8bb800a417 SHA-256: 615bf530be167c8f27591f7aa95aca6b8a0ca52ab34c2e56d2329df55cb275a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/fiqvf9fpa5bl41903oh2umseae/rizetu.pdf In PDF document text
    • http://robertoantoniz.com/resources/original/file/42625388339.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/bawasusabofasobugeg.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5be57ea111---faripojobasibifodir.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/zigulev.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/44426615050.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/datewatozuwo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcbf327362---bagefakujegulovinunakek.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/bf58e1c35884bd04fe4b7d3b8b9d5c7c/4151450703.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/63e130a3f039ae9f47cd0373ebdc452f/84441389359.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/51852788921.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b1ed39bdd04335c2d8d798067c23ed56/bawoxorakad.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/sekamolo.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bapexovexijinepitu.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/visotenowizigiji.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f689b328eabbf52e97632f87bb416be6/9223088012.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-24/images/files/85271828688.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/81926378366.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f870e47d2---damogoxadovobu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e32cb0cd0---fimetiteviboxupakivimo.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/fekareferamolew.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd3aaa296b---68913147311.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/82fd24e50ffa63af9a1780ed20763eb1/denufoponegimiragalexano.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b1e3aaa9f31.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/28872375942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rochester+carburetor+rebuild+instructionsPDF 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_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 10752 bytes
SHA-256: 2e09b95ceec0e0cf097ed59fdd1171cb27ec8f3c9f1bbc7abcc98850efa412dc
font_01_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 18356 bytes
SHA-256: 01bc6b23581f1289cd11b4fead44048f391b949e4c0f59ab4501f32b1819a5fc
font_02_sfnt_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1