Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b6813a5565877f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 19:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef475bb70f0c84c5899303bbf9dd6df5 SHA-1: 4612380a2b889bbcc8ec55348cc051be19233d50 SHA-256: 88b6813a5565877f4810424e5af6c08a3c624f25f1790fc287e278d366a232fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects users to external URLs, as evidenced by the numerous PDF_URI and EMBEDDED_URL heuristics, which are often used for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.immo-uno.com/ckfinder/userfiles/files/568296674.pdf
    • http://ttfi.org/app/webroot/userfiles/file/fuganakenasuvarupi.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/74338575049.pdf
    • http://vizit-k.net/uploads/editor/files/diraxebatexanenotu.pdf
    • http://webbolt.fono.hu/data/editorfile/7458315971.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b05f83536d---napobekuluwif.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614df3c057e58---13258825683.pdf
    • http://shiinamotors.com/js/upload/files/65505147291.pdf
    • https://evrenmentese.com/upload/ckfinder/files/zidono.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/rudenatevufisunez.pdf
    • http://qiuyutv.com/userfiles/files/20210908115225.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/jodojobisok.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/70743606999.pdf
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/31320195758.pdf
    • http://autosoftware.company/autoresponders_images/files/91814582448.pdf
    • http://ktcyy.com/ckfinder/userfiles/files/joditizofasomigap.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b76ea18896---81707597176.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210918_B43876ECF07EC879.pdf
    • http://ippinnudon.com/uploads/files/losapigire.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fce990e561b859e31223cb8d886aa979/rexutufazoser.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614d344e98d78---migamaleduzotelukotedigam.pdf
    • http://atol-res.pl/uploads/file/tovof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=why+are+contacts+disappearing+from+my+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af18.bin
84d5ddf798f2a02b899a786be1106d4ed41c21df44b7ffcf6d617dd8c967b7bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF18 16140 bytes
font_01_sfnt_off0000d7f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 16792 bytes
font_02_sfnt_off0000f00d.bin
4035854a6585060ff9f91c28eb9532ba54cec1845a3e9b45149c1a4c6f69c0ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 11128 bytes