Malicious PDF — malware analysis report

Static analysis result for SHA-256 0866c9cea956790e…

MALICIOUS

PDF

100.7 KB Created: 2021-09-02 12:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9dce319b5bec82a3716990ae26489a58 SHA-1: ce52aa68aeff1dc7be279426b4e2428c65877af2 SHA-256: 0866c9cea956790ec9387a54f6223573b20e415dea8f4270650202dca8fd87b7
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 uploads or link farms on disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=truly+devious+pdf+free+download PDF link annotation
    • http://nedirajtebosnu.net/userfiles/file/pinupomifabifakisofo.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/rasimepobokeviz.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/39441343081.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/wenoforizefimenoli.pdfIn PDF document text
    • http://shesob.com/file/files/fureliguxebaw.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ba9603c7---duzagezobezovivegarev.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/12823230618.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/womigerufo.pdfIn PDF document text
    • https://wineart.online/userfiles/file/52502856505.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/39d7285a8f12bd933ae9af711658a8ad/somobapulepufewinokol.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160dc21c11c8ac---74836081596.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c0b37da50---21651547699.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/50124512750.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4t0rj3tbnishdcfpak2bss5332/47792127061.pdfIn PDF document text
    • https://fishuntpesca.it/file/rufakemilawibuvotamam.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/84960222146.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/wewibumore.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/45304970907.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24182c2e5---6561356975.pdfIn PDF document text
    • https://congchung7.vn/upload/file/sewat.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac24317ec5.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25eabc2436---44352416717.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/lefagojatifosafu.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/17700149079.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_off000120e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F5 19528 bytes
SHA-256: 99709b8f3563d657a9626934897bcabd23f35560fd0345f83bdac9a38e278a13
font_02_sfnt_off00016bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BEF 10724 bytes
SHA-256: cb8a7f3ca019ea5b45ce99a6f1a05542daf29ff95ae53ac2f0105a7f7497db99

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