Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd496243aae194c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 02:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9fea5bd09c304189dac80fea43bc72a7 SHA-1: 50ba383acdc3167d034fcceb7520fa0c42554314 SHA-256: ecd496243aae194ca63124da41e7a74f5b2d8fdd413548130e536b9bfd5ae15d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 https://samudra99.com/contents/files/25162551598.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fdc9aefb80ac989895bf4a7d064d2c04/68045010972.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/54710491724.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/36806512872.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/zorojusavisep.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/42487438395.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/nudonuzomibokaluf.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d228b499c---momuwuzarukovimu.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/latepalejinabefumib.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/96228240946.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1ce7754b1a9ca60de5e9399cb01459ea/6992024733.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/notapogizoveluxeji.pdfIn PDF document text
    • https://phm.vn/upload/files/11166134782.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/61886840094.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/97276974755.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/sefufejamaxupap.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/90537753124.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tetipoliponunoluzarazariv.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/vupiva.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/kopixuzeterera.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/lolerupaniz.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/davolukosaxorabidup.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090716362973499.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/tonezu.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/negusudol.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/vadejuzatig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=wonder+ebook+englishPDF 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_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 17956 bytes
SHA-256: be3360996074fbe081ae839ed92570e96afe89f297e0a62cc4cd0d2d46ccd1a4
font_01_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 10492 bytes
SHA-256: 9dd4ad1095e02876f7c040d89ded21f10b8f242ac48ae71b46fb826faf035954
font_02_sfnt_off0001313b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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