Malicious PDF — malware analysis report

Static analysis result for SHA-256 198e05ff72a9486f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 11:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 358aef26623f95166c46b311c20bb88e SHA-1: 6962c1a5576801dc559ba64aaeff3ea058fab792 SHA-256: 198e05ff72a9486f1c0900553c46bee35a6e23d0b2ca7a6387905d88cc172712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/supoxunil.pdf In PDF document text
    • https://living-stone.lu/userfiles/files/zafilodikasaginup.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d999edadb---32143134782.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610fcf6acd987---siverejokemijarulek.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090269fd5a21---30941990162.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/javosodufuwupax.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c10ff1fb89---xiliwojamikebiril.pdfIn PDF document text
    • http://dalaichau.com/files/besodum.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/90qbbjm1vctnrj08jo6vhl40c9/jelitivazotapowizike.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/96400622790.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nugisiz.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210707153537.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/defutupopoporoboma.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/1e54a1c714f0a4de407ff869df8bb6d7/dibojelivotexed.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1c76a49100a4cede2d13faae75ca989e/76232478014.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/wuvufulotoxoxif.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/vifesiguvunadexeduted.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/63536718171.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/xijewovugi.pdfIn PDF document text
    • http://consade.com/userfiles/file/6240449054.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/toxirokipumefonawoxumepu.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/gakopewewapavo.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/82042810562.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/92242426655.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/9446557549.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d831181ae4d3af96489b5294575dfa67/66489055621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=little+tikes+car+bed+manualPDF 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_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 10700 bytes
SHA-256: 6b9aed79525f252e42b2d697607fdde9653a259652e71b0782f4c4d3f70b633d
font_01_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 18948 bytes
SHA-256: e292ccc45fce95ad94f297e4a95fd6a8d3cbafc66ea39067ac5d4235fcc302e4
font_02_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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