Malicious PDF — malware analysis report

Static analysis result for SHA-256 db681970d435626b…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 09:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c10d85f01f68fa19602be8e7e9d9c2b SHA-1: 2632e3bbcb3bd19821c618509afa3fe1635e173b SHA-256: db681970d435626bd843f799beec48e0c091596e19b9f6326e33b04ad4559012
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, directing users to numerous compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file's purpose appears to be to lure users to malicious sites through a collection of links hosted on potentially compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/556v093gmfnvg7n10qee539482/vutumuravadojuniwuxuniz.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a484288b489---57087536203.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210827132123.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/37205325843.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2e0cbd76b5acbaf2ed1d001f507fb70a/35775435925.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/29488157324.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3l49at1ip8jn5spqr4mkshn5l7/61374314657.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09fb4701d---92021844110.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/gisuxoxenus.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/16678231143.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610c081019ad3---wubiko.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf80e7594e---xunedemedadogevapaba.pdfIn PDF document text
    • http://turnyras.lt/Files/file/30930147412.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/pekap.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/ff3fc97cbd381d6826fe7df54f94815c/xusaxomisebuvifedu.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/35682173995.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/tosapilonibit.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3000e4d939d1a745253411c719dc87a6/xidijime.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495e487f0b---luxopuxegokibiw.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/juxibitejepezuluzi.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/vegokolazazok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=types+of+co+ownership+of+propertyPDF 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_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 10532 bytes
SHA-256: a5fac0054c022f2ef8ae020f4dbe68fabc5f6f2c5ee934c9259cfe47aec84452
font_02_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 18056 bytes
SHA-256: b7302343f78acece212ff9d6ad2d89c8c5336ee34980a8e6dda79c7a7d413eb5

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