Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bd4aebaa7afb36…

MALICIOUS

PDF

87.5 KB Created: 2021-07-01 15:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 02b44339f8406d4621fab8fb03b815fe SHA-1: c30fe0fea25647a1ae1d46a55f0f7fec24b3c921 SHA-256: b4bd4aebaa7afb36b3f0388c939c30698cc01d0811c17f8e830ab0b238d15e4b
156 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised WordPress sites or disposable domains. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://yssnewlessons.org/UserFilesTwo/file/ledujudupevanom.pdf In PDF document text
    • http://global-insurance-broker.de/downloads/luwerasidapopikodosusuzoj.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f2a6e0cf43fcd30208e20e91d512d8cd/67101763150.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/15406049665.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b36227a1c---55102583102.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/u8uk3p3j8n289in21kde1ap4ge/dozibadasodarapujub.pdfIn PDF document text
    • https://bdata.vn/upload/files/79828761815.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f533cb8f98---99962230965.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af74e0c921d---14057787219.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/gadiwovawosekulutosu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8d8f08f23d74885fb18caafa422c930d/69413757933.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/sijefubigowobasedak.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/lipemizux.pdfIn PDF document text
    • http://yuhongzg.com/d/files/jodezosezapofib.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/f29f72398e6a8694b6103bc76b7f46dc/futukaduroravikeduno.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a762df4b357---sukaxelan.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f86ba4387---5766550064.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983d8c99025---buxogutekipanexef.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/jmn81it65b00dovp1qoan3vfjr/kipokaxivewosufoz.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/63311244564.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/f83fl5i5n4iovgs4284bqju65k/sidebovu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/a34cq2r4cpc14njg5j01svlafs/22905810437.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fecb252233---wuleg.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c52a1b188eade62e48d8a13c8335deb7/wovabexi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ed9d3b6b---gizegilazo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58bc9fc8d---fupokifuruwakaje.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/hb8ffp293gocbn6b079c61r356/zekuwasasazovukixafisoseg.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/15216324236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=warframe+the+man+in+the+wallPDF 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_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 17276 bytes
SHA-256: 9618199bd958f74fbb9b016b5af5ab17d4c51367e34308c9c25c409091ae75df
font_01_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001398b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 10272 bytes
SHA-256: c835d69534a96e0a9032773765a40cd253d39193889c8223d65cb464f47d1ab4

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