Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2edb52cf323c0a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-23 09:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a41c5b996d69c361c10ff0c450b632c SHA-1: 7ca5575c50ca51246a5fe5f47b8c31796ee20614 SHA-256: eb2edb52cf323c0afb9ad0e68740eee0d871a4389623563089191197c78fc61e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sapporopools.com/contents/files/99483743815.pdf In PDF document text
    • http://kukubara.com/zdjecia/file/17722194237.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/30991991937.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/825e5b24919baab267aaed585da245dd/sawonunatazepudem.pdfIn PDF document text
    • http://webbuilders.com/files/file/34746890206.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da0886e15---24766907360.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/6081607273.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613363e9bc570---73326348972.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/dekerudufixosofi.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/ladubasesi.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/webufobasurowemazimazo.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/80081093492.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf174ea28c---jaluzadenarolefazupovaba.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/78108252437.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/33478375370.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/kopimosiwa.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/lofisotizup.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0f48de1a---denudinubesaki.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/11e0ae4b95ab679c534ae60f31191ef7/48903687381.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090916041964.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/jejojurarolujixo.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/42997479138.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614a36349bcb4---83620305480.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/61671787182.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/kukopeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jack+reacher+never+go+back+full+movie+download+in+tamilPDF 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_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 11232 bytes
SHA-256: db1d550643bf78ba5ab614b161f75ac24cbc35c0e192a29c7455ae219195a322
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 18784 bytes
SHA-256: f46029abe133ba594856eb4f417bd4aebc0a5616cf77dca1b3feda415f0f31b6
font_02_sfnt_off00012e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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