Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f63c24440785a95…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 22:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e987827fdfdd912c4ea854b62d2656f SHA-1: 1f8ac39ad9a35efd9cfbd0e7f67cd5c21a37421e SHA-256: 8f63c24440785a95715dda161c5f0992da29d88c07e3feadec9281cd890efb15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely serves to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=how+to+connect+zoom+to+tv+from+android+phone
    • http://autosoftware.company/autoresponders_images/files/mixixogizemuvatubilixito.pdf
    • http://seattlebestteriyaki.com/uploads/files/81241230545.pdf
    • http://ranjitabiswas.com/userfiles/files/fatogamabob.pdf
    • http://nakajima-ya.com/upload/save_image/files/badaladixawa.pdf
    • http://kino-cosmik.ru/sadm_files/rerosipasuvewemis.pdf
    • https://begili.com/uploads/image/files/makodugotadexojulodo.pdf
    • http://travellerisland.com/files/32308042442.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/21035895657.pdf
    • http://8njl.com/userfiles/files/jipejov.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/69758853235.pdf
    • http://khachsandomino.com/hinhanh_fckeditor/file/99442116061.pdf
    • http://ccsilver.kr/files/fckeditor/file/9537946236138c5e530414.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614203532afcf---xukekodakakebolipovaz.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/xolaxaduv.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/jajulogiwugeso.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/fm0u1vlgpf42l49anv8mv54635k2v3pe/76170461509.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdea33bc0---5130081337.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/kabozulu.pdf
    • http://tycoonmedical.com/userfiles/file/mosalalitodefugawini.pdf
    • http://redskap.ru/userfiles/file/46169302301.pdf
    • https://designclarf.it/file/19486060184.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9766757ba---43980295232.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142257c361c4---97871575519.pdf
    • http://tecresconsolidamentorestauro.it/fck_data/file/14670832811.pdf
    • 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_off0000d837.bin
42d1992e7d22842f8e4ab0c0ff18071af8e067d073e1845ba4ef11a21ae1f0f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 10872 bytes
font_01_sfnt_off0000f129.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 16792 bytes
font_02_sfnt_off0001093b.bin
80213cabd7b73ab04a97add6b0e26ea3d564aef63f802e9844ccbbb64fddb766
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 17320 bytes