Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18aef6143286349…

MALICIOUS

PDF

146.9 KB Created: 2021-06-27 10:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ab1e5933a41a4b8c7fc91b70aa8d682a SHA-1: 7ca893a6f3c66456108cd4d8f8b7aefe672772a7 SHA-256: b18aef6143286349f601c10db55a0cd088ea37a9425d8568a258b3d36506352b
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The document body is unreadable, but the heuristics indicate a focus on external URLs and link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://jjinline.org/file_upload/file/84021460844.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608734be76329---47086162860.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/300704f7d3777b97fff58be37567e960/favofomunojev.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/10923254267.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/h93272bfj21bigmghn6sn2c56r/rewelosadejubefivavogawij.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/74vpd7hrgthk56hbbp4gjk2eut/94185577309.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zawagufasavuziwidan.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/cd4thk7kqp2p0ri1lnjt073upv/zagugedusibekomubivip.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0987456fcab8ee142f896d048d2efc7a/bofazananesafi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef87f88ea9---detumemepu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f604fce613---bubimovijodadanirumerez.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/268htt3vj69blpvsll025a0mi3/vimebef.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0477f2561---12811172451.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ca4c8249---renegudanijar.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16087a686b2e5d---suxuginofobipepuwiro.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/60150118654.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/rawawevimuzajipizenogazo.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/8nje1vnsaemhmlrq86b906g67p/xafufafijiluba.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/sakem.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25141313976.pdfIn PDF document text
    • http://shosholoza.de/file/1106972167.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/lerosubifufuxitiwagatovev.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/zixowedifajulekabowawo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076331eb6038---32872088441.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092746fdf97e---sepazagiwelenozu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/894e65b416993482f17f868a8a9b42ca/kusuguzokarema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=french+political+division+crosswordPDF 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_off0001dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F461 19284 bytes
SHA-256: 474b20b1b4e3807d2f3cafb861d3d52e87cba66ff3dea93a8ea2748e3cbbdd90
font_02_sfnt_off00022512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22512 10740 bytes
SHA-256: 7bc8e5ebc622fae77b001b05bfbb75318053453912e83b469f189e530be2431b

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