Malicious PDF — malware analysis report

Static analysis result for SHA-256 46258679db63bb1e…

MALICIOUS

PDF

89.0 KB Created: 2021-07-26 04:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c09223cb834c9263d838c77633c35f3f SHA-1: dc62623e0a425cfb9789f256915537a3c4e84081 SHA-256: 46258679db63bb1ea8f50be7fcee0499500f877c0c1a5a11d7e5f2bfdc1b0ee3
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. It functions as a link farm, with many URLs pointing to compromised WordPress uploads and other potentially untrusted domains. The primary purpose appears to be directing users to external resources, which could be for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 http://www.thaiboat.net/image/upload/File/wuwinakupediduvaki.pdf In PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/wojojuvajubanuwejutafes.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/fonogabavolufifuwimanuve.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e58f71122a7fc305818129fbc3d62b75/77402375531.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b476123a1274e83ad49aa498d1851fe2/6401103581.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/gujaxuminuzi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8e343bfeed1214af9ae9f7271e04e6c7/xebajatomijirudimipabipo.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/munuredu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b1710b490---44835529595.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/vexadokabolo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/r3s5llp02jrsfnbich8va6gcf3/60051924811.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/q5doc1c06g5716dp19mrgcae9j/65351217657.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/dusetukevo.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b2e3ada86054094ffa7e1071532b71d3/kujerilonalesinapulibi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c14e7fba9fe1415158ff27b42d542ee/18338486502.pdfIn PDF document text
    • https://artenika.pl/fck/file/59079733137.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e69421b9df3---dexaforanuwadasogogubob.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609617d0db2cd---40213963760.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/49983104126.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa13725dd---lezawotofetubap.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/31590336586.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/jepubeto.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/31508928899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=annabelle+pelicula+completa+parte+1+en+espa%C3%B1olPDF 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_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 18412 bytes
SHA-256: 16217cca61c8b484c71840d345efb41a9e069661809bfcbed1d74b44db472c42
font_01_sfnt_off000121ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A06 11012 bytes
SHA-256: fd562a0d4bebcad79daa02a120c9490d04cbb728d4a75da98d0564406d4fc632