Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28f6be81de8143e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 07:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 726577e8d222e1d04fd480d82577ee65 SHA-1: 9c41208e01c3d5f945159ba000bd3a7cc4a431a7 SHA-256: c28f6be81de8143e5d315116b348103dfcdec318a3254a24507531276f8eb0ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of external URI heuristics and link farm patterns suggests the document's primary purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://drafthe.ru/uplcv?utm_term=game+changer+chess+book+pdf+download PDF link annotation
    • http://hotel-gerard-dalsace.com/upload/document/pokawemomesaxaritarex.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479b2a85d43---lowovumojipinefedanuta.pdfIn PDF document text
    • https://oasis-travel.ro/files/dekuviwumomixavanebejevo.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/79627869163.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/46645820645.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/93309482754.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c05220945---54174377660.pdfIn PDF document text
    • http://servmed.net/userfiles/file/jogogabasisobupilat.pdfIn PDF document text
    • https://eniedu.com/data/file/20210902172730.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905203319843175.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/15249486414.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/47360569615.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16152767ad50dd---37705658296.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210911103413.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/mowigivaviwisi.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/gixava.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/3007853488.pdfIn PDF document text
    • https://steammining.com/userfiles/file/jemogelavoba.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/42794397779.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/kuritajutezene.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/rasurekomepefoda.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/wuvuxivikamo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd5600993a---47350910196.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/19215571691.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/88300537169.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/80467348179.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/62016916529.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_off0000b3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EB 11236 bytes
SHA-256: 782902c18d285f087044ac887eafd6d891fa1977e8e76b50712c95448ff6b371
font_01_sfnt_off0000cdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB2 16712 bytes
SHA-256: d7f91d7a23d4870d7a3694b53b234cb2a906f40dd3a8a975214c3fe8ae0ab3f8
font_02_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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