Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30d907ac10e8a4f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 03:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5f4a21d017bbe454874bea52bdd23d1 SHA-1: c077acfeb11f7562bd938633df41c61731e0dd8e SHA-256: d30d907ac10e8a4fb7759be82b7243cc26799d42c7dee7be36ce6607139ff217
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://livbiopharma.com/userfiles/file/96154332030.pdf In PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/01/49631765565.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/52330167654.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/dunawadafedimanubaxaveka.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/61091419845.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/wuxarudin.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/kujoda.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8b90419be---guzuxitebezosifixam.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acb61b84b---fesidevotevezereduxora.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/demutenipusebapenegenam.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/18309864452.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/vifolipasezeboz.pdfIn PDF document text
    • http://ranchobg.com/img/file/veseguwuxakonom.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/eb3d126vndgnp9iofu3okf4g30/xolamivukuzinojovurunefe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fb513b79ea37585001e755843ebf0386/letowojikexogakit.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/30764743079.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/mevigol.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/34706856043.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/76625691822.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/26001497472.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rewavedoxijuvugimigumuj.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/11686553213.pdfIn PDF document text
    • https://karthikaspices.com/uploads/file/dakukuributuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=new+punjabi+song+2020+dj+remix+mp3+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB044 11584 bytes
SHA-256: 9ab78697a1e9649630af0f36f6b226f8468cf7773312f0206c40f25f69196b64
font_01_sfnt_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 15940 bytes
SHA-256: 11c6090f550f9160e3962304ba3ab4e05aa8290c8f75fc463ca36504abe8f71d
font_02_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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