Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24be2bcae71e9d9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 10:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10c3d7040d5add91c75070e87fc8f3b2 SHA-1: b251dacdb9aea372128215192ab76a5f95401bc5 SHA-256: f24be2bcae71e9d9d43e47116a2c213d8f25ba699f814d2b4378ac78e9b729ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=solar+street+light+price+list+pdf PDF link annotation
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2af12543e---79831857560.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf7652fc4c---96085957991.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612c58c04220c---xepirod.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/muguxelidubeserivarobo.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/8bhtvvlum6acp5mtm9k7l08h2p/54010804176.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/q8opd3mufuojh8bj7th3egild5/84872748086.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943eaae4ed4---dobeleko.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/kasavives.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/mefixilaxulavanelivivaz.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/38982072835.pdfIn PDF document text
    • http://pasted-radio.de/web/files/17675467342.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/fowatilugoxet.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/narodiwozi.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/nevibagesam.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160732f17123bd---46470166871.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/bibetosot.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/benagexoxoxunef.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c724ded97---8997257696.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/93b9789630463778afac4c6dcbce52af/jaxunubigerosumalexowi.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/watelimowoti.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/78160790735.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/45097920315.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/mujeb.pdfIn PDF document text
    • https://ebooksweb.net/files/file/73430027417.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19a83d78f---kowitiwugiduluboz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160846b23dc368---39419107080.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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 17480 bytes
SHA-256: c5a6f51f0eec16fdc604459fd9b245506306aa273a3400077beafb3e3475c342
font_01_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 10868 bytes
SHA-256: 4d20d05fea25797e7bcd9e5aab3303f3ddb2ec97546b4cfc0aa84a9e4a4498a4

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