Malicious PDF — malware analysis report

Static analysis result for SHA-256 b844d6a49a6f237f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 14:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aaba58b16136701e1d1a22324a7da8af SHA-1: 59ee81cd14e9b7d10c21516ee0075f65bad4b4a6 SHA-256: b844d6a49a6f237f0ffe5a372e00b6525b714315fd378cd2830c36d168bf431e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and multiple external URIs, many of which point to link farms on disposable hosting. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload, while the link farm aims to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • 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 https://soccerauquebec.com/userfiles/file/66955311478.pdf In PDF document text
    • http://anquocrealty.com/uploads/image/files/7246056043.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/61896098275.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/47211253085.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/44422437108.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/basimosasaruneluxutitewu.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/61722296446.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/lapiwosapidiravidobef.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/60916777565.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/68635767566.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/fulonezonofonazolo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141903bf08a6---74464737573.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/16227710685.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/9635090762.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491b85419ff---64029222709.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/7807510755.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/63145286552.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614001978d5d8---6604557485.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/82548853716.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/rolatekomifositabiwilosud.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vatijipolawexabujosel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gta+san+andreas+all+missions+save+file+download+androidPDF 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_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 18372 bytes
SHA-256: f4ad68410dbf587ab964cbf69a402792ca4ab0e45f85e37700611efeccbc85b4
font_02_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 10704 bytes
SHA-256: 5b8b3816743b0dea074772dc2c8846dd0665f8e3658f00c8e5ffbb029cbf636a