Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dcb64cd76ad03c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 01:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 87321f0254a6a5b0b816cae96a8daaf3 SHA-1: a29207b84f3a3898cdab8d78ea68931b006bb8ed SHA-256: 91dcb64cd76ad03c93fd7f193ae837a0dc30420e20e715ba5f1a2aca4c544ed7
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a high ML score supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://piauiaqui.com/ckfinder/files/3906016412.pdf In PDF document text
    • http://pharmorgsyn.com/upload/files/sowategaborolunopi.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/tilidubaxufaxaz.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/suduxub.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lrac0mmt067c1l911suj9mn7tj/48357767538.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/21977074604.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/wonunanaribojimoxa.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/gofutebuxenipujazebe.pdfIn PDF document text
    • http://humanlitech.com/files/files/82969197130.pdfIn PDF document text
    • http://snft.ro/media/file/64804732286.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/26948590942.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/paganapavesazuramuxur.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/tuduvixakepapefa.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/tivofoda.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/livorim.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78c33d44b---nedugumifisosi.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/42312144941.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/saredotam.pdfIn PDF document text
    • http://sjhtractor.com/d/files/71253840174.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/85523640066.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329e78e9741---62411076739.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613693f1735bc---pivudowonok.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/vomexawekegutamafujodavag.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2f7db809---93636610101.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/tides.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=unzip+7z+androidPDF 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_off0000c1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 10060 bytes
SHA-256: c3a36b36f009ec5490887718c94341a37463824559c87c9768f9833cabf26dcf
font_02_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 16724 bytes
SHA-256: ab2c4de22f1e82a575e62d7a70677b4bfa4592f8af9b70216139633dbf19cbb9

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