Malicious PDF — malware analysis report

Static analysis result for SHA-256 f968ff4902d2cf49…

MALICIOUS

PDF

70.5 KB Created: 2021-09-12 19:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6667a23b60892a49d2b8287cd2f47a70 SHA-1: 2477c40215ee59496433a0dbf90bf35975012f5d SHA-256: f968ff4902d2cf497a86a9dcdd2d5c1306efb74dfa831722fa09f7a7e50fdb69
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, suggesting an attempt to lure victims to malicious content. The presence of numerous external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://heyumpnd.com/userfiles/file///52009247385.pdf In PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021910826366520.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/23824272992.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/44049317234.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1657918656613c735cb1f3e.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///nivegopefa.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/78079384165.pdfIn PDF document text
    • https://atiksigorta.com/files/vadotoxijunemogijededela.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/jefasududa.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/af237d580eca59e1635818ef1c02ed63/luwenomupera.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/67734feeda973afb173ad934f7bb80ee/dinadinemiwaxin.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/91671623449.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210907025452.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/vuwunijutujevomap.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/1768707348.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/20879944598.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/49008105724.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210912_6884E33A85C4F7C2.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109050904482288.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbb00232c9---juvarosodedozogeketasidos.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109030736033899.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/lalakim.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/86537181684.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131308d131e6---pupufadazedokugofubisafop.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/joxizibimenazeja.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/nupenowem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=clash+of+clans+hack+app+iosPDF 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_off0000b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB482 16212 bytes
SHA-256: a27e80152062300c256f64fef5e2983707caf1602911198c86ea746ddd120714
font_01_sfnt_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 10372 bytes
SHA-256: 40b25ab7123927e1a8f2c41fe3ea9e0c38f65c8d085d6dc041666adc13f401d3
font_02_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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