Malicious PDF — malware analysis report

Static analysis result for SHA-256 09225b510bfadbc1…

MALICIOUS

PDF

91.5 KB Created: 2021-09-05 19:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8866d83171edfc1b60686d54e110ce53 SHA-1: 8d8a10bf368bf2bc80ff02d46b3375944072a716 SHA-256: 09225b510bfadbc1e996e8ad5d2bb80c109fab5ab95cf34763f59d606c4195f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fa4017d21---6332728532.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071b75769a96---39541145799.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b700be6d7dc---maxurujinupod.pdfIn PDF document text
    • http://beiks.info/public/file/13229177151.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/32571341280.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160da5312e43bc---28257441008.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/dexupovuwebitepaxib.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161182e1589c04---jakakataloro.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bbb700922a9ad4b27e4ee7de3cf2bc39/87153364589.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1mr2flraiafnasm0kntchprfeg/61505845406.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118cf743a216---84302683894.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/81346772869.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161270e13c9834---wesifisa.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b842a103f8c---11243487969.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6go7hsu2kp3la4h4rmqkfa5gq3/bapek.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c217374458e012fef2d2b852fe0a5b7b/50636536825.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/120048868360ee3dc1ad34e.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/41268156510.pdfIn PDF document text
    • http://steinemann-ag.ru/kevavezegakalixenevepaxag.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c808d067649a1735136e98c0f5ef0f28/fenedadazonupaxubeterufi.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/xemet.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/039ba4bd4f00a7c3ed8495fa572a7441/bumekekomepaf.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a426568e7---61375077333.pdfIn PDF document text
    • http://belst.by/upload/file/24258699317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+surat+ar+rahman+latin+dan+terjemahannya+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010b81.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B81 17436 bytes
SHA-256: 799ca6c9acb8f89ed30bb58e03baf4d2b6e1a28c8b0650fa90bd438df1153b01
font_00_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 11192 bytes
SHA-256: 2d44f540c054a53a3e1b6ecef2527d523fc3c6906c5ebae53baa0ca902fb964b
font_03_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 22136 bytes
SHA-256: b773dc24cab7024e7a7514eca1a9807ec1b1f48b3d196924e37deee513945f06

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