Malicious PDF — malware analysis report

Static analysis result for SHA-256 db71ed7e02747b61…

MALICIOUS

PDF

79.6 KB Created: 2021-06-20 09:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 750a7d84e7cefe0a8c66a9e5d9411944 SHA-1: 9fab299e6ae76bdfca86777cb4effe343d99a196 SHA-256: db71ed7e02747b611d4a4ffb78e38d46be34b84d42ec14af8d15dba0e1edd0e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a common lure, advertising a 'free fire hack aimbot download' to entice users. It utilizes a link farm strategy, pointing to numerous compromised websites and disposable hosting domains, many of which host further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=free+fire+hack+aimbot+download PDF link annotation
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/papotasubuvuxifox.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/pujunevelelewirebem.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/42b6a962f10787f42202dd41b85d2d99/goronivu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/00cac33dd567f7154dcb4f74f34c6d76/tilulexasarezubulutoriton.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/23388202513.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af72e5670eb---ravetovemekonu.pdfIn PDF document text
    • http://poolprotektor.com/userfiles/file/vugabirekovadutobesezimam.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/senoda.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/gefemin.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/85763511147.pdfIn PDF document text
    • https://icbacademy.com/upload/files/52862912808.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/86579472042.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3ccdca626ca6a02795fbb35b8902d732/mikid.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/07d73ce750bb68a94d1aa1eee9bf1d73/petujalejawabejosa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/doderawilelerajimenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 5332 bytes
SHA-256: d8037ea7615bdd21a9823cded362543f0026b85403e8168aba02ec59a02c07f9
font_01_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 15000 bytes
SHA-256: b945a402d21a774cfd9e64de216110463b6082437bbf4a6e8354b205846d1021

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