Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b3a0f225e06846…

MALICIOUS

PDF

71.4 KB Created: 2021-06-20 17:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f54d94b7ac248d49ba5a337aaa79a81 SHA-1: 387cb079c0c370fc2f42aba7f74c93f019bb41ba SHA-256: 79b3a0f225e06846f1b0705840cdfbbc7463554086f967c8652fb7e106315469
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f9334109c43d2bdda7bc3fd8a41d5242/wozupo.pdf In PDF document text
    • http://syarmarka.ru/userfiles/files/jigupirep.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850d3b7c91b---sedofuwadanatevowidikibu.pdfIn PDF document text
    • http://tipiland.net/upload/file/bogifumuzakedixa.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d73ed8924a62d0ad9a3903f41688017f/bexokitowa.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/faripidefotetivozi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16085eaf96340f---zonanirusitibikere.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737079da9c5---vixixopixarokapebaxonif.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e5b6038b4a4443d56ed9992bdde93b7d/mekosotafetutepadok.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/817c0491555c962b622399225f5a977a/wotenulotutobogutepiman.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/6mdabaib379rlkun7aoa7dhk2f/31475639037.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/6893509869.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/xaxoxevalanuxeratol.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3e463aac---88615261684.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737921358d3---rujirilunumufalupuputoji.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27784b088---88023596715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tensei+shitara+slime+datta+ken+light+novel+volume+11PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 5224 bytes
SHA-256: c72ea573feaaf219f5c3fbb66af73c03ac7748dbefb7ec5aa84cf2a0f93178e3
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 5364 bytes
SHA-256: 3c799880be44c6ac532cf34f450b58d1246c0cead3f7c063831f2bee6c5fc29f
font_02_sfnt_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 10040 bytes
SHA-256: acee5d8dbf79904e862bf698522062573773e4c6a5299ff81d8bc7e262b366da