Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1b7eebb00fdf8d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 19:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c6f0e50a0e6f663cf848c89c594851e SHA-1: 9d82ad3c8c803f54658c03999a32089ce88f86b2 SHA-256: ad1b7eebb00fdf8d8c88dacc4f615bd6b9cfc7549b41c87287a8b7b3020ae96d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to potentially compromised websites or disposable hosting. These links form a link farm, suggesting an attempt to direct users to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://web-news.eu/www/pkpar/userfiles/file/54007770796.pdf In PDF document text
    • http://karpatskiles.ru/store/files/sogujasaletobi.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/43076349090.pdfIn PDF document text
    • https://advik.net/userfiles/file/48314211757.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/kemesigogawopitu.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/34047033759.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/7180787276.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/88304890290.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/91579075938.pdfIn PDF document text
    • https://andana.us/files/files/kerimavamere.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/wesufidexodibetazetegokiz.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/jimekusini.pdfIn PDF document text
    • http://live-net.it/file/poxopotigarixuziral.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba19019d43---nidepabojafele.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161417f2fe928a---89750219429.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/zusajamogeniremuv.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/44119804677.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/11162172360.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/xepofujunur.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/zogepi.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/95627566507.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/95566074011.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/44568132317.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210917160250.pdfIn PDF document text
    • http://exima.kr/userData/board/file/57093280598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+ash+gray+gba+rom+downloadPDF 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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 17804 bytes
SHA-256: ae0a3cee78038e6cfc13566ec0e0ada3d55ffacf4e85602eab23fd453ab10b16
font_01_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 10940 bytes
SHA-256: ee167585b09929c7a2c08fc683eb5cd9b3f623c439fa95a1e6593c2cafb67065
font_02_sfnt_off00012d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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