Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a9ae2f206f58b0…

MALICIOUS

PDF

84.0 KB Created: 2021-08-04 05:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab9a1602d4e6e75180861512899e5f82 SHA-1: 552ab2d0c93185d5d8a0d97805a919ea0a8ba216 SHA-256: d4a9ae2f206f58b0b01cfe5318478cc8203c57ef5c14fd705d0e23b3b9bb4aae
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=year+3+maths+worksheets+printable+free PDF link annotation
    • https://service-panev.com/userfiles/11648129403.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/nususizexamigegimekisu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608651e29b513---guzopokabonu.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/442c20153bde1a1343d2c39747a0761a/30385154470.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608508c5e8f08---zasolulenivizojozuwiveve.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xududadawizuxasa.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7n649a6iiouvr7ufh77ig192cu/50864816058.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/majobegogabobexilukebigi.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/327046241.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/baganekanofovavikizoxib.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3086bda8d---42740988186.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/73896392413.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/192b52ff64ccabfdf139d9aa5b7a104e/kagoropenipurenujejeba.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a6f4381e0---3513571775.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/kifovowunivol.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/98844368958.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bce5cf1f---11249440179.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085576731496---wesixazawazasalogu.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/53668661516.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/64f3cd7533e0b073590b7ed542475b63/37239954798.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d4952fd34---83687627172.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e964c4a2b77---81394332589.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/migujanafafepebagolamarom.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/30898211929.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e2dc5bacb647b668434b954503df1650/nivitesa.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_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 11096 bytes
SHA-256: a3aa055c6e3fbed439f559be89f2a3319ab06d44fba55b39bca3813d2eb6bb6b
font_02_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 16544 bytes
SHA-256: b49877bfb8d32b5bec4d22e60bbb447e1b3acc6b5e07c2941c2539521f00d0a6

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