Malicious PDF — malware analysis report

Static analysis result for SHA-256 f646450f909e338c…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 20:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a21a68fb1055384637bc1ea557cff92 SHA-1: 26322d349700da661e8c1f5f4986d7d1b01c2b87 SHA-256: f646450f909e338cb812fba68737f62e422ecc4d932ff91c78fd205b8860d80e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These links form a link farm, a common technique to obscure malicious destinations or host malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8d391ed7---tosufilex.pdf In PDF document text
    • https://media-get.com/userfiles/files/powopejogonekuv.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/godinokiles.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089775f4ef21---zogexirugabafaselo.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/famubasojajepa.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/ribidamutisijiferotaso.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/mamekot.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1b0fee274d438a491b16d1d6a4e143ab/73546435797.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a11ed758d---tedoxel.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/vubemupepufuxujupiremixu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080742b8e0ff---30672974713.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/46192453636.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8f7b9105304357d349f25821f4f67efe/4430137259.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/vowodagudexusep.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/5280257876.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b36c0f40a6c---xigabaxun.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062717042273499.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/fuvepufuxirozixojokufunil.pdfIn PDF document text
    • https://arerp.kr/data/file///venazojeriwejagoge.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/80288733290.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/2eteq332hu59t7c8u26n9m5ak4/lodefir.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/20215106366.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/tikixafab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hanuman+raksha+stotram+telugu+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_off0000be8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8F 11036 bytes
SHA-256: 9e72a0f5c43511db573554a132291994067f81f69ed7cd22c818edd7b8b57b5a
font_01_sfnt_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 19988 bytes
SHA-256: 8b70f5cc3b2b17e2fa1e89e9f2b9ec0919fa604ac12966ebbad5fac0039ba2d5
font_02_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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