Malicious PDF — malware analysis report

Static analysis result for SHA-256 9592de30b495a938…

MALICIOUS

PDF

73.0 KB Created: 2021-10-04 02:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ebb4675621220d6c8e30dda3ac1e55bc SHA-1: 30cebb698071094f245f8c3212d5e399fa483bb6 SHA-256: 9592de30b495a93864510742701b99144ff2d457ff2a3cb942b49cb41d20ab6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://suurelepa.ee/data/file/xojubowutuxufuvezonul.pdf In PDF document text
    • http://uforoi.com/app/webroot/uploads/files/80226074765.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/jonezizug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb875a604---xepopesavefubuvevakebo.pdfIn PDF document text
    • http://activesites.atiks.org/files/31791245206.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156634f5fc74---44745755337.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/vujevefinugusave.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143ea2143e30---zokup.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109261453312615.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/77826469794.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b204f9c3f3---54672746805.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/jalobefesodux.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/20404010402.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/59197153286.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4de7fada283f1fa164253d64017e3ecb/wetoreduz.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/pinelaboxi.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/ropenelaverevadik.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210928020827.pdfIn PDF document text
    • http://sireny.net/share/files/84702271341.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/solidajozome.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/ranaxiwutubepir.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/ginojelipujo.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613834420c2e7---83410715756.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/widedurabipolejenepasot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+solve+quadratic+inequalities+with+a+graphing+calculatorPDF 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_off0000b585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 18096 bytes
SHA-256: 328b3c9c8778feeb8bbe562cc8b58c92395e9f60d1929a867fbcd2f0a08ddfd2
font_01_sfnt_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 11180 bytes
SHA-256: e22d8a54bd1b1899415d11af878a5819642e79d75126feeabf01025c63f54c79

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