Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d809153afca93c…

MALICIOUS

PDF

77.5 KB Created: 2021-10-04 11:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9744ffb32fcd0fb3ff67777bdf6c9d63 SHA-1: 4dd9babda7aaf4daad243b3e4ed16391a0187fa6 SHA-256: c9d809153afca93c69dfb64b4b8bba769ef349306ec79a46aa50712ca0ff4156
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ladachess.ru/userfiles/file/86176191377.pdf In PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/80544505236a16cb4f77264ff53efd0d/5872654698.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/15096069207.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/nepozazololip.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/kapixizoxunumu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbecc38560---87833842629.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/28554940594.pdfIn PDF document text
    • http://ymmicro.com/files/files/nufedofusinaxuvaxolobomo.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/mamivunazi.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210919_3A649A712FF4D263.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/58844446286.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jalewakogexovonodopapa.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/joropigajodepapofujulewas.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/wenalekoguvevifewosi.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bibipasowatika.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/zaboga.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/32264514939.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156ddb1739ba---xujasogive.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/62179656519.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/272c10cabdb8d2899e3faf2a6dfae72b/kikirikinejaliru.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/5237718167.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/43078552415.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613245d1a2cf2---dozojolenakig.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403378b50ab---11854979573.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xotikaxapumifemarariwov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+add+picture+to+acrobat+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_off0000c806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 10612 bytes
SHA-256: 25651aee5cc19fdfffc1b3a00ac71854f6a0eff21b0bfba4fc5bbc06abd828c0
font_02_sfnt_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 18428 bytes
SHA-256: 75c2b0c09f1ce53136f70cd507fd2efe9b7ef9e673ba0c7cc6ec1491a2c699f9

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