Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d934663ee7148e8…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 20:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f75f60c7fa992c73fb619b5ce4a5e347 SHA-1: 1a36c6beb8036aa906f21767edfbf7109f01f05c SHA-256: 3d934663ee7148e81ea24b15b0b218c2b5cecb9b98ff459d5f2f910f098f6711
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://addon-colsman.somantec.net/ckfinder/userfiles/files/fevefogala.pdf In PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/sepixokoduvoxesi.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/noguladidorazukaxamexo.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/duvuro.pdfIn PDF document text
    • https://sambelteri.com/contents/files/walaxefozasewir.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/rudavedenokejow.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/60075233239.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345bd2bce32---27437271059.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1f93005bb298f4fe0411b61fcb636600/selilabexenaborasesajinab.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/jijuziwalozoxenezimok.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/tavufinav.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gizanab.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/60361973401.pdfIn PDF document text
    • http://hrudolf.com/userfiles/buvanawunafulewun.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/jumufopujorikawomi.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/gonem.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zabujufopobapisebe.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d7ed90ac---6113326169.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/sufinevixinof.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/puxojiniwoniwovewowekuz.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/5642815257.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/96687051664.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zepofis.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/31548656751.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/47983426988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=xbox+gift+card+codes+free+no+surveysPDF 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_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 18084 bytes
SHA-256: b7fe25fe3ee94e2f4e14f989c3620350a05f39913cd972bc99da82d9797fce2e
font_02_sfnt_off00013002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13002 11136 bytes
SHA-256: 4d2880255a30662052b4b0bad1bdaac755b76b8a95d12369fa836b6243a5177a