Malicious PDF — malware analysis report

Static analysis result for SHA-256 0826f4c99e396315…

MALICIOUS

PDF

93.8 KB Created: 2021-08-31 02:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df255371c6bcc6ad9ad7681ed7bccf98 SHA-1: 8ae8e1cfc7e0fd3a9cee2b302cd1950673fe480e SHA-256: 0826f4c99e39631511817492487c3d0f4653a20988c7ac845c15869d99eca249
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://colantuono.it/userfiles/files/lobizunonujijuxawebanejem.pdf In PDF document text
    • http://salamino.pl/userfiles/file/tadisasulegami.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103f41a0019b---tixisabefuno.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/29df495b61abd0830dfcdf7eb78fbbd6/barowepusipuv.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/beraweronanalidiborasu.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/mipolesitulatek.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/gokutamokoziliremupimerij.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/41607145062.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4691a49360493bd15ab1b2349a4684d7/30426099066.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/55724923973.pdfIn PDF document text
    • https://rm-parketi.si/uploads/98305420145.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/52248242827.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/19852123912.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/34870263755.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e22febe74c4638019a3909c10b4df10d/zipukonidagoku.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/jizugijegokirepunefib.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/qo9bfkql0mo24vlg8p2ra0pcvi/69656479210.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/66356262305.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/eda0da9cc80ebdf97886927cb39f2625/jetufexavakulisa.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6d1301b1d71c1f3533ddc3fc4f9a3f85/11581689252.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3cebfc090db6a5d8854df0b7a91c5a63/viwuririvorosawemexafos.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/84023774667.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8854bb92cf---webopa.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3fd2b808d---borologarefojaxekigubonof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=look+someone+downPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 10044 bytes
SHA-256: 31ea40f3ed46c5c69eb4f1b84ef8e35d748a6a97e57b8ec20e3f7666efcddc34
font_01_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 24548 bytes
SHA-256: d66edfde83edcf227ad090688657532a7c41a8a03217f881b6f1afedcb14271d
font_03_sfnt_off00015275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15275 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59

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