Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb06f2a1adace911…

MALICIOUS

PDF

91.5 KB Created: 2021-07-01 23:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 92c97be32804bbf8eddc2b6607c12f0f SHA-1: cf29ca8c184d8fe8b45868e3bb1516c4dfb8f54a SHA-256: cb06f2a1adace911db5600b0d5aa5bd62bbd30a10f7f803613f0c7bbbdeaa503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm with numerous URLs pointing to potentially compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/aafc0cee20e1b0813d1f61db7a20bf2e/wemezi.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ehvv43v2l4i4n3sflitehiei4v/nujuwatogotowogenajo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/12713800719.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/13803014308.pdfIn PDF document text
    • https://luminex.pl/upload/file/22305164176.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a833c5ff1---bufefujatatel.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160735f501d6e5---99851073222.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/71673371814.pdfIn PDF document text
    • http://chongros.com/userData/board/file/71474933163.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/wamegipobijamum.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0ea20367---23450679459.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/94538821770.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/sitiludisafujafosipefiw.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/6815080544.pdfIn PDF document text
    • https://raljob.com/userfiles/file/26933663074.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2a1f1c984a3612657826e226286d6609/rebalekofebotenowuz.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061219415073499.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/pezalubogikorera.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/loxokiroxoruwerawopatojo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099351e86827---29975409521.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/femakavapapozefegupabopu.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/94214797786.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/73191611592.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/vuj2ms4bpb5u40hm687o2u7d17/kifoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=principles+of+marketing+research+pdfPDF 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_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001196b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196B 17380 bytes
SHA-256: c0b28ed7e53abd96b9291734b340ea47a48b28ea71b4f43433cfcb7e4a0ea105
font_02_sfnt_off0001470d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470D 11160 bytes
SHA-256: c17ab920b4962b4c4ac9a9dd7d6f884a5fb64361e17ceaf06c14702d7aa9c7d3

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