Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0355aa871bd4efd…

MALICIOUS

PDF

96.4 KB Created: 2021-08-13 17:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 62f1a093a3eb4beb3f24627e18cc8504 SHA-1: a94d728ff51236f13c786b1b3c1d35933b373cd0 SHA-256: a0355aa871bd4efde55d069d6280ed8afe8db665d1acba5aa94846a878e6d04b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, possibly as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccd95f1eef---17575987197.pdf In PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/patepezil.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f63855b0c7dd44d7344d8202e22fb048/dumufenujemu.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/33363822245.pdfIn PDF document text
    • http://abpaluso.com/upload/file/lisejin.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/gusozetonulofu.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/67325737341.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/54925862024.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cstprn1645rqsqo8pcpskh7jd8/bojodudixijox.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/2844dec88bbaa57d97424e0357e8fa41/23130810350.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160791d878aae1---11320357764.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb031aabe5---lexir.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5738aef2e7a30729767881e972bf5f82/8438735120.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6929a0bf---70182559768.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/21815890290.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/31635208981.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fa6mkums2nhnh3ht3t3lo1q5m1/16629458965.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/14731563817.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/38297647197.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/julofupi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1db31324---guroposajugifuve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c775731353---vefejifuvojoga.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/27977962719.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210725222556.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf27bcbd3a---zesefopokutisogif.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a04a4535e---4688878653.pdfIn PDF document text
    • https://medtek.vn/storage/file/42512463574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+absolutely+true+diary+of+a+part-time+indian+summary+chapter+28PDF 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_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 11564 bytes
SHA-256: 1c9f1c7f0bf671fa57662c970fdd7fcbc14f4ec8fb5a020bbfc35cba36cb7e52
font_02_sfnt_off000147b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B7 16592 bytes
SHA-256: 1d06b52ab180397bf46b7ca6fa9c9548aad14cbb68e4d46e9069b34488090951