Malicious PDF — malware analysis report

Static analysis result for SHA-256 755bfbe4cd7afa9e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 15:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9e83a612cb5d933c9012915583666ba SHA-1: 8e15295303eebcb32079e48e3e6e1909cc3e93b7 SHA-256: 755bfbe4cd7afa9efc5acc18d5de1f5e383ffecd5724d4b9f901f2d4d025b7a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=best+anatomy+and+physiology+book+for+nurses+pdf PDF link annotation
    • http://indexone.ru/upload/file/xuruzorunetix.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109071001299698.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/mujifusoxinak.pdfIn PDF document text
    • http://vaithun.net/upload/files/kelemekosudovebafemu.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/70491801952.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bagozozobafaxobilik.pdfIn PDF document text
    • http://mobiliteit.nu/files/livazodawuwefoxexegonefir.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/sozizurojabumimoti.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/32745757502.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/46442410656.pdfIn PDF document text
    • http://classtool.info/upload/files/gerizijupiresolijikezupi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/1817149783.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b4fb5ed3e1098addd69e800ffcc435c7/vomisipavakezapezefutef.pdfIn PDF document text
    • https://actorconseil.com/files/file/19877257130.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362e06bdae4---90289291690.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/32203466883.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/45881809085.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tinuworidaxowuwepe.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c171902fc7b0dabbcc2d9716d87d4a94/guvolekanawaxupovabi.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/nipovikelapepani.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/negixunumuron.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/tenolupup.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/91626567996.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0e9d88824a272ffe1b9653b61342b7e3/dazosa.pdfIn PDF document text
    • 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_off0000cf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 11444 bytes
SHA-256: 9159fb007a3277ab2aac0acf359390b983f24441b1326265461ecc554482dc2a
font_02_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 15888 bytes
SHA-256: 904f3d4cd6b17a61ff7cb95be125b0d4422163015f9fadd3ac5fbe5fb0d5215a

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