Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9843d3950cf439a…

MALICIOUS

PDF

85.3 KB Created: 2021-08-03 07:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e425a1cd4a945c42aeb8a8f6f81d2448 SHA-1: 071c2395d991685c8bbe5f2d32b2b63aced82998 SHA-256: d9843d3950cf439af226ced93a07091f11a7d0295fcc1cb7254102bc22352455
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=carrier+infinity+touch+thermostat+instructions PDF link annotation
    • https://dafelia.com/files/kowunujipego.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8fcbf89918fafbfeddc9c82739e594a2/99490598125.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085e5a0015e---29769038750.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210730_9B71E06EBC0CA654.pdfIn PDF document text
    • http://denge.aero/upload/files/90123950346.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5c5ebb9ce7be0fd92ccf820a981800ec/xoponobizenarijajanojamo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/32de03416645f5a363b518df69134866/woxisojurarumikekanofa.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/fuzuvuvixurojixenotibol.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927241f17ef---45738854086.pdfIn PDF document text
    • http://come2menorca.com/images/file/58739639759.pdfIn PDF document text
    • https://umartravel.com/files/59748376676.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104290223363723.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e6db4756125---90360338022.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/92370739390.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce169fd6d---1130792885.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/24892159038.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210706104437.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/81427739566.pdfIn PDF document text
    • https://avenue102.com/uploads/file/87871116905.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd806cfa01---86641177537.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/5891814346.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/xonuvaporugazifeju.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa23c8d90f---96295498338.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/86491223492.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f8396ecaf---15119577675.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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 17572 bytes
SHA-256: c8bc8c9a0bab1029370460b95631c13483874a9aff3de5884fd12ae8a7f91074
font_01_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 10800 bytes
SHA-256: 8b8539e73c33ee4c56aaafd2a42d8d276e34e730af0cab613265f2ff4b6842c9
font_02_sfnt_off00012f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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