Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1dcc7fc7e9e9ac…

MALICIOUS

PDF

98.1 KB Created: 2021-09-17 10:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42dba31f84c63ee400ab588dad1f9adb SHA-1: e012aa06e60539fe49dc35902e4de2118e2ff3a2 SHA-256: fa1dcc7fc7e9e9acfdcffe1aef32ef023d01e0d6c6f686e3539b23dd69dc296d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=final+fantasy+crystal+chronicles+remastered+android PDF link annotation
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3bd2b70b8---nezogozifudagefedudikeli.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358427c32db---98396788413.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161413bc401a8d---nalitonudepagesozitu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/40956378652.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/zurajapuwufa.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4d420818b---gegozabiruwixibebojodas.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8a281eonaqd3qbc8t8rus0bnu7/63050589945.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/43754728117.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133254ab0504---dekumemamimasawugajuwixo.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/33175022298.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/jajirizureruf.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/kesososemireliwifi.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/xikopivotapewuzitimozeza.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/laguxidefifuvexaxojowinuk.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/74062628869.pdfIn PDF document text
    • http://hiniceshine.com/upload/bumate.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc85481fcc---kalidupezatelapoker.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/72970931667.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/65919913247.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/98106860388.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/paxuvigixogefaribepewazo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/11799523203.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/32345606674.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/natunevitimik.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/39212542232.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/25190932034.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/27255038782.pdfIn PDF document text
    • 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_off000114bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 20072 bytes
SHA-256: 4031ecfa221fd8714cf39ebed862d1fcbd2942098ece8972b2240f7899c99da1
font_01_sfnt_off000148f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F0 10832 bytes
SHA-256: 66325ff219f14835f46fa52480a1db5f7f45aedec8b75f52d3e5ed594241a496
font_02_sfnt_off000161c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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