Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8835193f5bf782…

MALICIOUS

PDF

124.1 KB Created: 2021-08-26 02:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 204aff8fce42277735852ac8379f606e SHA-1: 1313f3798baffd349238e39caf268517dea125a8 SHA-256: be8835193f5bf7826af40df060b7c2806290b2196a673292ab1202841cd174a6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links are likely designed to lure victims into clicking through to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/g1fllqmkd9h5oq0gc4d6e09ed3/punozokolipur.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/35d460eef6d2a0d25771685d2d739739/lojefagimimamalazuves.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6840f1769f---jokanoriraxupoka.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/40287578867.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eb8287425---75124747869.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/c0hsjfv3bivbe9g8m7bsbaeev3/jasajexanatawapafozob.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/molivagewi.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/79751874062.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/bulazosakixarekavuv.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/38606383558.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/35895524040.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/kidedan.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c63729e2a59887ee1f6bc940a5789ada/fifapujejiwumukaduwolivaf.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/61137379943.pdfIn PDF document text
    • https://stvorki.ru/files/file/86726466076.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/l1a3jgglvfcbp5dfrlms77v7b6/77258284562.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/48158022424.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee421e9ed9---62440036692.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tokuxokagadidopilarabeno.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dead70290---26597596675.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/23313784977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=out+of+many+chapter+outlinesPDF 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_off0001846e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1846E 10984 bytes
SHA-256: ad44d45a3d699bd10723ae2baab8f1f39963e46226dbbbdd0d30a192f07d9b57
font_01_sfnt_off00019dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5E2 17116 bytes
SHA-256: 72d3fc87023374d12e1039eb43eaef273ce64f814545321b060ee8dc081792a3

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