Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab67c3c36261bec…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 12:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95c6b1a4052384d20757bfe29c139ec7 SHA-1: cb63f379da44d30802941e3dd68d34cb223074ac SHA-256: fab67c3c36261beca9256390e007bc2a65e355ca9fcff27413883ce3d1f5c402
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests a phishing or redirection scheme designed to lead users to potentially harmful content.

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 https://aymexco.ro/ckfinder/userfiles/files/pekafejepij.pdf In PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/dapaneperixafidokenajo.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/a9f8d30795a06e8a49a126a4c6187bab/92091512160.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/78680836797.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089107809793---57125537972.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/pibiwit.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/74131861536.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/36575646649.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/29947c2d373ae935b6c12818e5b9f15b/tagiturubinozesadafun.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161283180f3cac---robijejiganopuziv.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/nelolesamiposulifatim.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/69914375301.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/28835254779.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/46863877154.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57672935479.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/9bdd9c2f8eacb7bef76fe953296fbd56/56007974661.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9631af282---84787545075.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/dorojumojisatalisulefo.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/43016691176.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba324110f33---93252766019.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/14524168091.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fasezaponanomuzajele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=rugaciunea+inimii+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_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 10576 bytes
SHA-256: 8397137b6c70746587c306acac220f12074626753d553ea020b1090565d85362
font_01_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 17968 bytes
SHA-256: 00b8d76413f592321774b9b12ff398bd5368aa595489cb5022e3cf40909b1766
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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