Malicious PDF — malware analysis report

Static analysis result for SHA-256 098e42aa2e1586fb…

MALICIOUS

PDF

93.6 KB Created: 2021-09-07 20:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6659bb2064c5a3984b592527ee71f82f SHA-1: 01aa796ab7162ec33169b6ebb44e19267979dae1 SHA-256: 098e42aa2e1586fb4a2f24f6d7784ec89df3c931fdda784c17bf615a21a0cadb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rocincorporated.com/domain.com/images/dynamic_pages/file/gopalobuzivofikulozipaz.pdf In PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba92b2af216---zubekonuj.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/93942641252.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/jukibu.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630728633_05f94d56ca.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f5d8687e---6273224994.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/vanasulikoti.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e3c34fbc40f6e3b970d8e8185ac46c20/93175515342.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/92571364371.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abe7760d717---61049447975.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/87559615267.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/17771743421.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/189e084a09ab1a1f85cc39813a1c120b/wuwugumemobawewu.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/38022279159.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021080122581627.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7bf4444d8---42364333209.pdfIn PDF document text
    • http://thedreams.cz/files/jitosudadofas.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/b940004fbc40f5da79fc90578e35f629/24794523272.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076bdea7f199---wowubagikuzagubared.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77377953875.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/jejofasolivimexikimawomav.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/72122495388.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/wodal.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/vobonijom.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/nuduxibejojijoxujis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bangkok+map+with+attractions+pdfPDF 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_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 18820 bytes
SHA-256: 77d3e1bcfceddedc1eb8cafb3e4782d0d9e8e3bb077b2548f9d68c53349e55ca
font_01_sfnt_off0001367e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367E 11120 bytes
SHA-256: 422e246be39b7a5eca155471fff1eeeccafc8517afb47ad474b9f64cbe1ea479
font_02_sfnt_off00015026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1