Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd38d3ed2e7ab87…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 11:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7c1b11834674fa343606303ffe03cf7 SHA-1: 52bcfd64a0ef3f021724581ef3e49769e25ac08d SHA-256: cfd38d3ed2e7ab877fea348c8bde264b150755c4e116b8db9dce7dde91d7825d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to potentially compromised websites and disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://khacdautron.com/Images_upload/files/57492031492.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b9fc5131e92fc6d1881cb3d615859ff7/62476547259.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/98438425454.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tm2dkc8q5kmh0mpv234ro65ovb/soruwuvo.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/6k0188po04mjbbutjtu91poc42/15536299046.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210804_C88A4AE824D897EF.pdfIn PDF document text
    • http://kingnature.ru/files/files/makogamelal.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/tosasukozexateba.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/sefujixapevapikesaloleja.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16082841dbb455---30327272927.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b969ebc0dbf668fa363d10ed6c1a6872/621932815.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7807fc4e4a---tasit.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/9346587455.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a8d272318---76045122378.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/luvirul.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/kivajom.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/15024452539.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a13e0df5c---vaxivezelemedabutezadow.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad2e885ee---pisevubuwipisuvabotaxiwu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/63796206606.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/13985691649.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/26397006345.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38de983f2c---66343146608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sunset+point+grill+menuPDF 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_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 18140 bytes
SHA-256: 36dc12b35a7dc575fbbe9c24f10c1aa1e4c8467aa47a7ac154b6063f720dfcb8
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 10608 bytes
SHA-256: 00bb05562c2621b25329086bdf085500aaab5daabf32b00147bc6cd325ab50ee
font_02_sfnt_off000111a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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