Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ddb888224a403d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 15:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d969abf9b818060e81596800ffd03957 SHA-1: 2cd0e810a53df2a479cd64d8e7af3663b89982f6 SHA-256: 61ddb888224a403d39be43c3b7f0ffa3ded35b1f50d565a438466c7cfdf0d3ae
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for distributing malware or conducting phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of numerous links on disposable hosting and compromised CMS uploads further supports the classification as a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://studiomontironi.eu/userfiles/files/25915429113.pdf In PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2fb6c9b843f3635d01705143d053a5e3/furolu.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/koresetinozuberix.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/bagaxuxowuxegel.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/71788218676.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea78beb91---79965205068.pdfIn PDF document text
    • http://ccadl.com/files/20210903142115.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/56881757007.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/78604177785.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/79722719811.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/41854271756.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd15d8386---ronumama.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/kebaxera.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/tizugamazigexiwadamovesa.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ee49779f29259ca7cc6e31b96c51d39b/30139131992.pdfIn PDF document text
    • http://apismorava.eu/docs/webiratomi.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/73907907139.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/tarerototomuzimuwoluxeku.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/fakozi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfc4bd7a6---mosudizik.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/liluxijalotutenelisu.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210913200604.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead650f67c---73457465359.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/wevomimum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gta+liberty+city+stories+android+apkPDF 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_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 10892 bytes
SHA-256: 3095aed184e47fa211c6beede62d407b79c6ef9942cca99c4ae04eb05396b308
font_02_sfnt_off000113f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 17956 bytes
SHA-256: 52803da44c0b241512d9d7b472ed77e6ddfb5461174a7a65739b150d9fc715d4