Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef5da8104b0f962…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 02:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc391b3f1f68c3dac8c96ddf43cc6256 SHA-1: b496ac8502c1bcd8a4e6d42b993f80f64e779417 SHA-256: fef5da8104b0f962f3eb6fc4d4107ed22a5631ff89e4156ccfb0d5199f52e195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or 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 URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://skontrolsengineering.com/file_media/file_image/file/nutajijobefumekaxezasu.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/503eca4af9120174c6a880e03afb2b53/79854484920.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/12975075175.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/4d3c0ffb926359c039655d06d7eb37b1/zalalajabaxabewejumex.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/24708786284.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3d720bff74a50d89f3fd7e4539491812/xular.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/mizopuwa.pdfIn PDF document text
    • http://vswet.ru/f/72644213722.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/topele.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160831659d5922---fapemirujojezefi.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2467d9de---31374406430.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3d8d1691b---tuzefosefasepasumuleb.pdfIn PDF document text
    • http://air-con.ru/upload/files/rigelidigujelaxanorodifo.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/84670995959.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/92542319009.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/vagodofinez.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/lasiziz.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/balatagedejamo.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/judixak.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d096f096e2---55661018843.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/46236279177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=jurnal+penelitian+jaringan+hewan+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_off0000b6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BD 10796 bytes
SHA-256: 049a67939dc864aaf53c745c3e85732e35caa78b8c4b649594a7367fd63cfb52
font_01_sfnt_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 15104 bytes
SHA-256: 24cae83e6828396a44046b669a7793b862cbccd1d41f5413109272eabeea7ee3
font_02_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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