Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f432372985cc2a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 16:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 63816bb14b42ab91380aef37ffe3384d SHA-1: 454e167434adec0807676730d44af61ae3301211 SHA-256: 48f432372985cc2a4859bd6fc46388e96f3cd4646252d57541226ffd4681d710
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to disposable hosting, indicative of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this pattern, suggesting an attempt to lure users with search engine optimized links. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=rayman+legends+download+for+android PDF link annotation
    • http://medizator.ru/ckfinder/userfiles/files/nabipolopiruledupenosef.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/64424489958.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/46593049295.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/76081113488.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/todubigakejipapepunago.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vixijilomanixobugarijej.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/3913360184.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/08/37417024660.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/54048574384.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bb5550983---jowosopifufekovi.pdfIn PDF document text
    • https://paperland.bg/uploads/file/kenuxajujowodifixu.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///morararalekuputas.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/77782041833.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/vikikaxe.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bc6b325c1fa3d1c8c58eccb1be976d80/nalelum.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/vafog.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1cee7b82---goduduzakenufukodib.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9b4c1e239b2fda231a584f866f83f8d8/wuligumasolalazipilaj.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/mekuxitik.pdfIn PDF document text
    • https://majubesar.com/contents/files/satubugevujunogofumar.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/dosusijetok.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/jivatalalakud.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/luzes.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/wodijemari.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613000ae99755---sefagududafatejoxopu.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_off0000b192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A9 10844 bytes
SHA-256: e36b68947d9bb6908e878ad15f12cdea72a7ccf251beb39a71f2825688d963e2
font_02_sfnt_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 15716 bytes
SHA-256: 3e17ced6c4b689d931dceed2466d23953db0aa74a19752110ccbc9d1a44f6ec5

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