Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5baa530efeb2875…

MALICIOUS

PDF

118.1 KB Created: 2021-07-07 01:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2e1e0d1e7567a508972f13e0518284f5 SHA-1: c122cc2d3b12dc6ac2a77c52a149c2ed4cdccd1a SHA-256: d5baa530efeb287599cc2553fa767c52a8fdf8c06d3e9580d9bfe919a61e6271
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, many of which are hosted on disposable domains. This behavior is indicative of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

Heuristics 5

  • 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://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607587d75580a---forisajufetadarudusonemot.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9e03ab04a---jofumenim.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5df2edbd8---wejuwuzokigigimuru.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c0365fe8734---94907368769.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/4065d25f74a3e77a8d86a02f87cced20/nabuluberaxalanupiga.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/71d374adac38606a249d5a51b5c38614/68948418606.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9ab422df7---robivot.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808fff7e4d7---4163808348.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c3dda346b40db93c54c3a6817b817dc1/47320152784.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/26961148384.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sawufaziziwutanavo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/o1vmsb71naln3brm2h9v1r0777/rawefa.pdfIn PDF document text
    • https://gilbertems.com/videos/file/33673797377.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/868cs0i24ft9ajs6n1ore3bef0/kofunagiratezita.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/cbec253b20e11dd4b21cf22ae681f3a1/11583334969.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8d984814c516c933bb84a30c681060e6/67494032734.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/g1kso5gqj7i3fk26c94iqk5i65/45523864125.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/osftekgcldsquma9362652kbf2/39934126631.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/mepepusukenodowesunanovaf.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bo2rss08jf8irecfghm57crnc0/vimefeleranosutovumovoj.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0431a3f9a6---18904033339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+black+heart+mean+on+snapchatPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000190ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x190BA 19300 bytes
SHA-256: 9120c09660e57228dd2a56313df6a7d38112f0bd5eb541d59c7a896a75862a82
font_00_sfnt_off0001326d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326D 2740 bytes
SHA-256: 1f0785f8c93d77628b7565caef40a8d661565152531fc064e0696a86183c3cd2
font_01_sfnt_off00013e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001563c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563C 21580 bytes
SHA-256: f772c14fa6e10e94acc9b6a8f8e900cf3b00e0bf656b6935a21858cc94621980
font_04_sfnt_off0001af84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF84 10912 bytes
SHA-256: e8721bca3800461af4c19151ea78134ad77c27d197b922a9f3851822d78b29a4

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