Malicious PDF — malware analysis report

Static analysis result for SHA-256 619973a057fa495d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 10:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9f40cae84ef91b53540e8a6203c1af6a SHA-1: 94d52aa89c5d5e966b6a3b98dd87e3f0c2e96292 SHA-256: 619973a057fa495db181ef05a9cc47843a28c49447ea1ca8f51cf665b82e866f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating it functions as a link farm pointing to potentially compromised upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rm-parketi.si/uploads/zatadewizaziwasalewe.pdf In PDF document text
    • http://tk-weld.com/images/library/File/75512459765.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/wamozawarewogobapofobil.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/47547646950.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/88147819948.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/busov.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb3bd3cc4---suwetabevegifepora.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614682b28c7ad---kawel.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/72897460685.pdfIn PDF document text
    • https://hgb.se/filer/file/kefaguzeda.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/kovukurajixubulamituru.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/dc8503741c36f881a4a327036817979d/70144634911.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/23765739658.pdfIn PDF document text
    • http://dongphat.net/upload/files/zogofumafideliwuk.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/xijukibemawipar.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/zogaso.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/naxikozelozagop.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/pulelufujizi.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/toligivoragibomof.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9698291e4---xifilajunulazo.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/41450559339.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///xagibavapexosejurabaxo.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/gabeperamiduwetogobifojoz.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/160488441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+chrome+56PDF link annotation
    • 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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 10640 bytes
SHA-256: 7aa459c6accd16abcdc80b3c5cfcace2c27c52f8fa6c265943743fc75cfb47ca
font_01_sfnt_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 17596 bytes
SHA-256: f51f93cdd5dc230dd70664ef03bd74886c1153870f39e6588ac32ed10470e686

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