Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9f1f0e2b40268d…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 16:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1d0b0fe2ef28a1664afe69703e39731 SHA-1: 8e24ca4c9a3bbd6e8a0e200fe89b37540dc3114c SHA-256: 8c9f1f0e2b40268d642b48e745e7e75e13d46d776fcd23c6d05706703cd53a07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, indicating a potential phishing or malware distribution vector. The presence of JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lezeckastenakosice.sk/upload/files/sudaturadufuji.pdf In PDF document text
    • https://mediaget.ru/userfiles/files/newexujivutasejozurabono.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/23232ca7db21f3996283fc40eca9990d/22819160733.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/sukavis.pdfIn PDF document text
    • https://alutat.com/data/file/gotubaxutebobu.pdfIn PDF document text
    • http://artepcb.com/upload/files/31786407644.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-1/20210901153529934186.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gbhkus902rck0omjr6ermi6b7k/46755613911.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/88444487832.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/25311709537.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/lesipotap.pdfIn PDF document text
    • https://amgaa.org/temp/files/fumedupezizujijamubiz.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/muvos.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/gitatuxezupilelokivixe.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/nudekiratasetebek.pdfIn PDF document text
    • http://chongros.com/userData/board/file/9240102795.pdfIn PDF document text
    • https://msvadba.ru/files/file/tukajewafujejurejex.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/23203922438.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/67985884660.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0fcd583c6c0fdfdfe8fbb10437a1d8c9/39928967245.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1893be0e2---sixig.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/13954523106.pdfIn PDF document text
    • http://annabarons.lv/files/files/74957639875.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/5cdced868ab9fcf596f6315f9c521d0a/33174409730.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/winaporirat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nescafe+dolce+gusto+jovia+manual+coffee+machine+instructionsPDF 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_off0000ba50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 11196 bytes
SHA-256: 2b9e2b93de34ff67ad7f458084ce3527d93ca0be04c64f4cb13d97e356b667fc
font_02_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 16724 bytes
SHA-256: 1c3b1205f5d7fa4b0ac716ae69494c63688b28d7e86feeac024f7281474433dc

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