Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4471a4d84d89ed0…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 00:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 72b78bd1c6c7481b43dc2a9aee728a18 SHA-1: c3c53c1b0a55c6a3b31c8a62852ae14d9833adcb SHA-256: a4471a4d84d89ed0ef700b89e6ab34794452a667a3220dcdf2e1940a9976ad62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kimkhimientrung.com/uploads/image/files/kepizoruwevilotabigomafos.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29bf5b745---gozulobu.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/8ie08antsigspmfk5h3qad7sdg/javimikusigefuvomipegab.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/limojafujupigijidodesokes.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5b3973f224cf03ff3bdb5f3e249f771a/zapipekudoguwitomevebo.pdfIn PDF document text
    • http://svx.su/ffile/file/32514568495.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95726436675.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/kiredo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160744b8e10e5e---tonejugutin.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/77924093662.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/66398625421.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/dozovefeg.pdfIn PDF document text
    • http://bamor.org/userfiles/file/48417951937.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/zarorebepibesibepunuliz.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/634091489.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f4ae26165cfbf83b2c2646d14ab6a64a/redojexoxaxov.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/81d420485368e95cc13eb148a0845547/judigenubanevixetuwesus.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/q2i1e05icpe4rlgp0q1ibv3qbg/49092029974.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210903110730.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873dd2e621a---83469705854.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb89f811ff---81422036319.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/56436806515.pdfIn PDF document text
    • https://actorconseil.com/files/file/nemuzewavojewekuworavovuk.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/4458540000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=como+recuperar+pdf+corrompido+onlinePDF 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_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 10648 bytes
SHA-256: d92ea3a3433fe2f0a6f34e6f04343753b11e9a7aa343ebee92227c2a1cf64bda
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 20504 bytes
SHA-256: 79bb9f0a5c46abd9e20af3a16840f7fafa8f4f9c80a81c8909d8b12002dfa0e5
font_02_sfnt_off00013273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1