Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6d117231c5049e…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 05:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c303f56b0b02a377aa9997a79e440a45 SHA-1: b2a0ea5fef5f7a1755c40f0a3a7b1122ac890b7c SHA-256: 3f6d117231c5049ee4cf1cacc49db4360a32dd0eff3950d2deaf65b60f052cc3
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ccskin.com/geektic/files/22635522377.pdf In PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f906a3461b---girivopivupogezunejutoxul.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931c862ec4---nakefifoman.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/53022494431.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/68806752256.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210916045348.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/4461881846.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/79533490868.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/62434713472.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/jerawodawujuxidefuj.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/vesovejefava.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/73349064613.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/waxagibesetu.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/74191451689.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6j3mavvbq0liq6gedl53a00d23/48965081272.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/riremaxolusi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b4de1c983a9c216e8b08417ab9a8f909/67311563798.pdfIn PDF document text
    • http://labsshop.com/d/files/retanapijura.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/60244965600.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/fexuvojekutejad.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/18412170746.pdfIn PDF document text
    • http://cuiquji.net/d/files/xaromumurigugoduluvugapu.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/furobozugebaduxezipa.pdfIn PDF document text
    • http://www.moyekolodin.com/files/1718658281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=car+driving+simulator+ny+mod+apkPDF 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_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 11004 bytes
SHA-256: fd572097f77ccfe8b56d1bdb9220be8ebac5714cc7271c8754eb2b04f67a1281
font_02_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 17172 bytes
SHA-256: a38aecb05b4be0e9842d445e7df4641a92e94b56cd9f8194ba26da6102ce4c90

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