Malicious PDF — malware analysis report

Static analysis result for SHA-256 4babf404b43a320b…

MALICIOUS

PDF

78.3 KB Created: 2021-10-12 22:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 91e38e555c552b2c75485cbc8e48d989 SHA-1: 46c0d62f245802dc6600a8b4525fe825cd578647 SHA-256: 4babf404b43a320b271af5f12bbc0bc191d043d41488d56d075c555ac641f330
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://krisoc.ru/uplcv?utm_term=what+does+conductor PDF link annotation
    • http://chokmanee.com/userfiles/file/pefabadizep.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/23099660905.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/vobebezis.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/95912623997.pdfIn PDF document text
    • https://adci.vn/data/upload/file/82682027835.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/gumajokufajasedezifozul.pdfIn PDF document text
    • http://dury114.com/userData/ebizro_board/file/bewamipopiliti.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/mubim.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/voxusevojufewefumakosos.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/wajejasikazelo.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/dexebiwano.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/letofagev.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/21307406205.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/riwojopevifafirupe.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ji1tbdaq457pq33csldk1j9gv7/zebuja.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/2071743696.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/xijiletadope.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc3f0550e---sulitomuz.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1683f9128dc87a5101dcdb834593aad8/70639925070.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/63302648216.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161cb5872423---vilujazuseluravopawel.pdfIn PDF document text
    • https://produse-zilan.ro/files/53455529441.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/kegazazaboluzonivo.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_off0000cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 17504 bytes
SHA-256: 74073aa27ff16e0236e19866a8270b9641427b416f9d3b0b9dff03b54e9d0eff
font_01_sfnt_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 10424 bytes
SHA-256: df41fe7a10154e76395d5fc5571d57cd8e3ae0c941db33373beec0f464453943

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