Malicious PDF — malware analysis report

Static analysis result for SHA-256 30fc037a12a8870a…

MALICIOUS

PDF

113.6 KB Created: 2021-07-22 11:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d4c501f1fe1c88de245a72baa3d4e326 SHA-1: 4111b61f65c767a3d9f06092bfa0de20ae468cd6 SHA-256: 30fc037a12a8870ab79d252fe1163912cbf553bf41b2f1b5a51ca3f0c813431d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm hosted on compromised websites, directing users to potentially malicious PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a2004d1ee---82494551992.pdf In PDF document text
    • https://numen-wow.com/userfiles/cloud//files/nojomifitisaxeritipaga.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/642c31620b186ce65a5698bc73ac9a4b/wefejasivepurodasis.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/kojareja.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/sigafifefetalura.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ced4bbc8f---jagudelegibubisolekepeva.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33a35ed0b4---85386591099.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/ritadawufamoxi.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5671d4a7a9---7965898933.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/86711901239.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7d0713284875394e60be9b1c0a3fd7a6/guvatovodilumabopavogem.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/96ee9adf9135d00e177fbd2552e872bc/sawuwijelapene.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/93667285888.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/o7uhmkkpv7agu5valrdlrnuhe1/porosedusotepawoduwitulu.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/34980872315.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/43654009864.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/3dbe249d7dceac58f03ae71aed76460c/51294221210.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b828693a8---kemanoziwevuto.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd452ae9ee---46671226784.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/8608385851.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5a982371---bubebamutepabut.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/nb5oitljt8sslgaf2vs71l6p1a/nidubukijevo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/imrs53vb29gfatr8ob23kk24h5/serujexoteguri.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/80076893370.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///daxajiduzixitemixaz.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jubiwonujelemaroxorav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=localization+of+functionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • 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_off00015d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17588 10044 bytes
SHA-256: 3094ee4b7d18597a08d6f1f728fe2ca7283fc5dcd8e12b93106552fa363bb4ab
font_02_sfnt_off00018bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BFB 17148 bytes
SHA-256: b3b3474393440a2a2aea2e768e101eb0c59002252be08d530372736f0f2bdc3b

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