Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a91beb3f63ce98…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 05:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 53f9e736a25896ae66134a8b2f7feb55 SHA-1: 466d5404d7b63728177165c1c1da826ad72c4740 SHA-256: 62a91beb3f63ce98276bf3664db75b063b07ffa440b7b0ebda897029444b7fd3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and multiple links to external PDF files, some hosted on compromised or disposable domains, strongly indicates a malicious intent. The ClamAV detection and ML classifier further support this, suggesting the PDF is designed to exploit vulnerabilities or deliver further malicious content. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://monographie.com/ckfinder/userfiles/files/guvaloxilagazezotolod.pdf In PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/feputigov.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/75940696364.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fc02466edb08482cf8575f18d42fe887/wepoxaradoruzikaragirilaz.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091606072750.pdfIn PDF document text
    • http://millecolori.it/images/file/27264738721.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/34665790438.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/11025697023.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/jegog.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161516c328d0cb---54604593417.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/49142926970.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/71013182099.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151cf57db357---39686377958.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/36749055417.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kudegazipolotig.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3de6a68287798f7fcafa2810ce2b917c/gabefagujo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec757eb2e2---34577940932.pdfIn PDF document text
    • http://gibisch.org/files/files/jovamirifosalisa.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/tulugategexikojuwojim.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/32973091761.pdfIn PDF document text
    • https://jotelek.hu/files/file/zokonovowupig.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/93815363851.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/582767429.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/59691623348.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/89810429424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=a+little+book+of+common+sense+investing+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_off0000b456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB456 14560 bytes
SHA-256: fa3b5b17bc5434323b8e19f58f99da0e7f68389869f77c3b16fa99a860243cda
font_01_sfnt_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 10980 bytes
SHA-256: a2d18636195c648bcd947c23b59dfcc4bd1450b9b520ca93ee916b7499de6360
font_02_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1