Malicious PDF — malware analysis report

Static analysis result for SHA-256 b235d20b28e86b07…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 22:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4fcead3292949818efcc681eb82f40fb SHA-1: 267a9169b0dcd97431d278dc8d2d8c5a74702992 SHA-256: b235d20b28e86b071a380bd0f9d5451c0b48e0b2a13b8cb087a1eec073ec34f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://colegiosantarosa.com/uploads/imagem/file/sijisizuluvorobej.pdf In PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/xokuvus.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/77459591d9405d5add486c592598e7ed/60817275960.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/36811793060.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/kedupotisezejizegir.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/wapusalenixibopuwozu.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/61744626369.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161441d10d1dc1---20352260709.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/zugamagipowusi.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/kipefejinebenuzijituli.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/lojiwanokawixosozuvijeso.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/81140664260.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/xiputev.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/venuwetaruv.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/85960142349.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/94d0ef2b94d3e647018409f4cea34cd0/sojiratigotovubopafeme.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/33820518451.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/bf3129a7c327bb7b70f67dba10f65b41/gijufa.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c127568c5---23675775832.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/24496364372.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210916081646.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/bonavotoluduferufif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=calling+card+magazine+unturnedPDF 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_off0000ae5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5C 16112 bytes
SHA-256: 4fe940dfc83526dd3fa978fe2d325fda74d7747ffd4ed3429b9a0edca434cf30
font_01_sfnt_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 10616 bytes
SHA-256: 04eaa699144f9363646b5dae18028c3ed051e564be2a8db626daa4eb52347369

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