Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0bbea6719928d7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 14:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c00f86e86a0150c30f9b7edd9a535ee SHA-1: 1e26e6775528c390d594ad293adb57be92a9be98 SHA-256: 4d0bbea6719928d7aa982dd6b186c2204f20e95ef1374b7bba5cd94ce8d76ec6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e2fa1eb9---fasasofabubomumajitezaz.pdf In PDF document text
    • http://sartoriaventurini.com/userfiles/files/rajoxaketesi.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0aef9708b---guwexuvafumotapejebififul.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/nulilagagazigukebuki.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b79db68e---15123229733.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/44434716866.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344b8649cd6---56376105178.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/potawukavap.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cfc9de0b1---tenizes.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/18954503876.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/69732463271.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16307705878455.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7db9cc438---65601914635.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/oth0emd544nt1f7saj7atiuhvu/60634316855.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161341e77007b0---niwajezugoxeteluxowido.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/sigamidizuvo.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/fomakexewifaj.pdfIn PDF document text
    • https://airbays.com/userfiles/file/66015033963.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/76522207514.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/rasedanozivozasomipojus.pdfIn PDF document text
    • http://cartopack.be/Images/file/wupizilekonipigiwunapu.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/60c69cadadf20724301c198103bbfc5e/9676379180.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/1498372651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ninjump+deluxe+mod+apkPDF 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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 19652 bytes
SHA-256: 76cd285ee96c0fbe5aada0fb6b8e180e8b43a945d027fbf1203d6ee8f5d43c0e
font_01_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 10588 bytes
SHA-256: 1d67de088db736f111bf3413bc3a1afc684131e3c84f500cd5206034cfa78aeb
font_02_sfnt_off000126a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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