Malicious PDF — malware analysis report

Static analysis result for SHA-256 728ba2f6cd583ce8…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 19:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f54da66441fdf270d21fb48774bafba7 SHA-1: 053dfe29a130ed2a235bd21313725977f15c8ad8 SHA-256: 728ba2f6cd583ce8647b8b4eca96b4a299463dece54b994e411ea6a28f67787f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://kssi.ir/public/userfiles/file/gezukifej.pdf In PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/zogomujivininovesi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144c2a0b216d---wurezomupijiz.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416455e070a---38177973406.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/71657850003.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/wogetaxeboli.pdfIn PDF document text
    • http://hidramaco.com/files/files/48596114689.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/gijudopanis.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/27689886165.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d29eb4c11c---93442284457.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/54653706370.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/83200187475.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/27485190857.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/87059013177.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/barabe.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/mupur.pdfIn PDF document text
    • http://contelex.it/userfiles/files/17952680280.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/28593382567.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/jefixewopobuzuwemok.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1fcb964a1---19106628080.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091816031753.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/numeduz.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/mejibalidam.pdfIn PDF document text
    • http://linker-apps.com/files/31278043302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+tv+show+2020PDF 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_off0000aeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAA 10148 bytes
SHA-256: a155428dc26c6eb0141da0290a181bc33269b1273e34ece0e10d32028a66676e
font_01_sfnt_off0000c5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 14640 bytes
SHA-256: 03c6aaee07cd151debea824212a4b2679ce1399cb68587ec81a0229b9992ab99

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