Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a85f281db78ab9…

MALICIOUS

PDF

92.7 KB Created: 2021-08-12 13:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6e0825ee1eef7f814783d3b759f15f2 SHA-1: 8781c5a6065de2f9efcaaaba7cda06cee62447aa SHA-256: b0a85f281db78ab9157ddd2fe3418c75bac3a63eb0b3a793eb504a504604a81b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' lure further supports a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://nurugelexport.com/ckfinder/userfiles/files/491525211.pdf In PDF document text
    • http://robinsonsmithreunion.com/clients/879094/File/dogifoporifasarutijixaja.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/49005000089.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/wowexejutujadumebisika.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/390064b0122bc1bade24b49e8a26f761/85145661035.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b2744139---labobopagabofagoj.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa5423e8c---sanobotixo.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q4jk36cnvi5kgmm37nsafsaen1/61458770789.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092bdabf0b82---4404664468.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/69419810653.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/73339374625.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/74507627349.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160fc003bc4b4f---siwowo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/36155981537.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bdede35d309---6802748300.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5bccaf644---fipuzaminikux.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/pomaloxeronigadafatu.pdfIn PDF document text
    • http://hasyo.net/files/file/78878274396.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/51096035896.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/85098801806.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e2accd5e15df15b97271a4f43a710d88/mokige.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090053ed83b0---gibofegowivu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/25302758964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cool+animated+ppt+templates+free+downloadPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/34199834699.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_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 10776 bytes
SHA-256: 29bb34dbdf9a8b2f5ea95130e7d6ff05f8fc1b714b962ea46fc7870bfabd9ae5
font_02_sfnt_off00013873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13873 17372 bytes
SHA-256: 45c75b76249527e612845b498c4a8234f3e2b5cc2f96be32c71e595ff372905d