Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c18632a41f2bea…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 17:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17a9e210f87debc7d79633142268e7c1 SHA-1: 83c510518c274468acd18cde97c5e6f3bc47bd1e SHA-256: f7c18632a41f2beaf8dfc1df5790069758854bc21be1c200025d18273344d2c6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and multiple external links, many of which point to other PDF files hosted on compromised or disposable domains. The presence of a visual download button and the ML classifier's high confidence score, combined with ClamAV detection, strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of further malicious content, while the link farm serves as a lure to direct users to malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=gta+5+android+download+mod PDF link annotation
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/87443158912.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/8180791509.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/47485048573.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/79725094641.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dde88865c---zuzutu.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/xurolizutusuwidebis.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/30787660630.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/vitifajarexidoka.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/mutipuxukigosiwarajiwo.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/nuvosuvanutigavojuvezeb.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/maposekidupume.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/durolerozevatawad.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/27302746614.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/3096228582.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210911090142.pdfIn PDF document text
    • http://tyextractor.com/d/files/nutejaliseku.pdfIn PDF document text
    • http://furniture83.com/upload/files/8723161554.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/xegukozoginonuwe.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/92903303903.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4eb2ebffe89274b4ff337f82111370db/76123983416.pdfIn PDF document text
    • http://technocom.pl/editor/file/64920415930.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5b02df6aaefd06689ccc92efe8c19b46/wikidenizasibo.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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 10368 bytes
SHA-256: 1fcf162cbe9b6ebd8b52f17666db6fdc4e22ad53cce8b6b6ed54cd1e356a7064
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 17972 bytes
SHA-256: f27325f7d96df30c5ff375bf18474f1a1ba2e008f2533a026ceae63a3ee443aa

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