Malicious PDF — malware analysis report

Static analysis result for SHA-256 151a0b352e359c26…

MALICIOUS

PDF

90.3 KB Created: 2021-09-01 20:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b0273bfa15aa17d36e102f2c95e4f496 SHA-1: d9470a415fa9755328aa89019037eb332084f8ff SHA-256: 151a0b352e359c26071947c955a349e51e5b88ef9c2b17b10165926a3183b932
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The heuristics indicate that the PDF acts as a link farm, directing users to multiple compromised websites, likely for phishing purposes. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=self+employed+courier+tax PDF link annotation
    • http://progfin.pl/userfiles/file/9771938831.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8d5ca51e3a04729c5a742edd6e4b95d4/38753609565.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/500dd0e536bcc5510af19044f49f6019/wupogefofuwebezirazorikog.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/fumibofepusosexikukopibe.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a68b491cb---80053691480.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/wunojor.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/vuxemiwek.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/48594636928.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/1705781017.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7036da9fa6---35836071677.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5a9e0072088ea308c1812d27ed0c016a/wurulasemovoso.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/72977844752.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/70184611614.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/rojibixukogopowaviluxixud.pdfIn PDF document text
    • http://falls67.com/clients/50406/File/pajipakusilagesikilunilik.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/t7vbfkfv4d3um0komqksc2kck2/xeganujoguxa.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/rinorurefominujopun.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/80596711544.pdfIn PDF document text
    • https://wecareprogram.org/images/file/kanakikuwodidenekosumu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-23/20210723024908495131.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/29206611467.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_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 10900 bytes
SHA-256: 21bd7d190e48e829da619dc01ce8595df3d174e965f5af9c1fb27233ca8d8bba
font_01_sfnt_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 18540 bytes
SHA-256: 4111387901502c2a385d26cfc0e81d2dea4621b324f2b8796c983c401cea2cbc
font_02_sfnt_off0001430c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1