Malicious PDF — malware analysis report

Static analysis result for SHA-256 350ecfef4abc55e6…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 16:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78c3835b6aa96aeb63bb2fcc47022141 SHA-1: aa17abe2c841f0258beafa6fcb1a6c7c166029a3 SHA-256: 350ecfef4abc55e6097646daf88cd5b7f0f69e9c6b98488f637214f2f607c4b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://grabnerestriche.at/woxudizumowa.pdf In PDF document text
    • https://usgcambodia.com/userfiles/file/tilurixarerozabez.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/zanaranoxises.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340f30bbc89---25202238603.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45071132540.pdfIn PDF document text
    • https://ka-base.no/images_content/file/gonapegogetujamelitutul.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/zeziretalo.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/nawiwepaxu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131a299be0a8---rumewisegamijo.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/19741162292.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/menubozilusibotines.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cbc40b00436d2250e69a6913eab13afa/52689772741.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/wewotadelovifugiloresi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3d165134---lekas.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/2555128274.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/40652088520.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/34208091869.pdfIn PDF document text
    • https://photofetimages.com/49552809665.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/17494909192.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a5fedfdac7901c44167a6dd39a123ee7/15391421137.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/wibajozefewevufovoxubawe.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090513114869.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/43186850427.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/lekawezegokanapofajukod.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/vuvaposasepatumizatuvu.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/sowiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=grade+9+english+past+papers+pdfPDF 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_off0000c210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 10864 bytes
SHA-256: 51f5dc40e7f82d09fe36956f8e4c38aefef8f07ea7aeb7bbc6e0a47a3385a956
font_02_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 16268 bytes
SHA-256: 9d6190b28c4587f25e4114d81379d95fb09d628fc139a581f8372516b51c21f7

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