Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d454d7ca6788654…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 19:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aecf9d1886e225c0b56d4ad2e726d4a1 SHA-1: 8c0342b60fac3c581b141158f87a98eee1c5886c SHA-256: 1d454d7ca67886544c448b7a50784a9c5e5bea57f1a8b74dcafdf808d43d848a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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://habrit.tw/ckfinder/userfiles/files/50511696324.pdf In PDF document text
    • http://a2kat.ru/userfiles/file/77972582098.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/lemuto.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/8604993476.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/31180222510.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/29934309654.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/debukigagazinugudikemidi.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/10424094655.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/66250286417.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/jidem.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/rknacmlsqp2j1e1n65kda37c3s/foraninuzusimal.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/tumitowejixusi.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/85745221848.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/36508961807.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3f447a78ad1db3b6e868c5a0aced7112/31102106722.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/97540669115.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f20722c796---benutaluwazusuzifejone.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/76967211466.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/famuxerogogep.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/vekesetavesiva.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/wafagojesanese.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/zisutudemipojore.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/33022157830.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/sudabigodozilatowil.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/pikazevikitokavagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wifi+hacking+tool+for+termuxPDF 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_off0000b2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C8 15380 bytes
SHA-256: a19421d38c90d124e73753f2efcbd902e40fc653a7241cdd3ccd51f597d60123
font_01_sfnt_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 10900 bytes
SHA-256: c0233f40a6ca29bff80a2740a376447e06b66ab4df8375231ffc0a1dfb4abb09
font_02_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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